List of states in the Holy Roman Empire (M)

This is a list of states in the Holy Roman Empire beginning with the letter M:

Name	Type	Imperial circle	Imperial diet	History
Magdeburg	Archbishopric	Low Sax	see Duchy	968: Formed 1180: Imperial immediacy 1680: Secularised as Duchy for Brandenburg
Magdeburg	Burgraviate	n/a	n/a	c. 1000: Enfieffed to Walbeck 1080: Enfeoffed to Herman of Spanheim 1118: To Groitzsch 1136: Enfeoffed to Querfurt 1178: To Querfurt-Magdeburg 1269: To Saxe-Wittenberg
Magdeburg	Duchy	Low Sax	PR	1680: Archbishopric of Magdeburg secularised as Duchy for Brandenburg 1807: Dissolved; west to Westphalia, east to Prussia
Maidburg-Hardegg	Burgraviate	n/a	n/a	1278: Younger branch of Querfurt-Magdeburg assumed the name Maidburg-Hardegg after inheriting Hardegg 1481: To Austria 1484: Extinct
Mainau	Commandry of the Teutonic Order	Swab	n/a	724: To Reichenau Abbey 1271: To the Teutonic Order 1730: Acquired Dettingen, Dingelsdorf and Litzelstetten 1783: Acquired Allmannsdorf 1806: To Baden
Mainz	Archbishopric 1356: HRE Prince-Elector	El Rhin	EL	4th Century: Formed 780: Archbishopric 1356: HRE Prince-Elector 1803: To the Archbishopric of Regensburg
Mainz	Imperial City	n/a	n/a	1244: Free Imperial City 1462: To the Archbishopric of Mainz
Malberg	Lordship	n/a	n/a	1273: Acquired by Reifferscheid; to the Elder Line 1302: To Luxembourg
Manderscheid	Lordship 1457: County	n/a	n/a	1133: First mentioned 1445: Acquired Schleiden 1457: HRE Count 1469: Acquired Blankenheim 1488: Partitioned into Manderscheid-Schleiden, Manderscheid-Blankenheim-Gerolstein and Manderscheid-Kail
Manderscheid-Blankenheim	County	Low Rhen	WE	1530: Partitioned from Manderscheid-Blankenheim-Gerolstein 1780: Extinct in male line; to Sternberg-Manderscheid by marriage
Manderscheid-Blankenheim-Gerolstein	County	Low Rhen	WE	1488: Partitioned from Manderscheid 1530: Partitioned into Manderscheid-Gerolstein and Manderscheid-Blankenheim
Manderscheid-Gerolstein	County	Low Rhen	WE	1530: Partitioned from Manderscheid-Blankenheim-Gerolstein 1697: Extinct; to Manderscheid-Blankenheim
Manderscheid-Kail	County	Low Rhen	WE	1488: Partitioned from Manderscheid 1742: Extinct; to Manderscheid-Blankenheim
Manderscheid-Schleiden	County	Low Rhen	WE	1488: Partitioned from Manderscheid 1545: Acquired Virneburg 1560: Partitioned into Manderscheid-Schleiden-Kerpen and Manderscheid-Schleiden-Virneburg
Manderscheid-Schleiden-Kerpen	County	Low Rhen	WE	1560: Partitioned from Manderscheid-Schleiden 1583: Under Imperial ban 1593: Extinct; divided between Manderscheid-Kail and Mark-Schleiden in succession dispute
Manderscheid-Schleiden-Virneburg	County	Low Rhen	WE	1560: Partitioned from Manderscheid-Schleiden 1590: Extinct in male line; to Manderscheid-Gerolstein by marriage 1639: To Löwenstein-Wertheim-Virneburg by marriage
Mansfeld	County	n/a	n/a	c. 1050: First mentioned as a title of the gau counts in Hassegau 1112: Count of Mansfeld primary title c. 1215: Partitioned into itself and Friedeberg 1229: Extinct; to Querfurt-Mansfeld 1246: Querfurt-Mansfeld assumed the name Mansfeld 1266: Partitioned into itself and Schraplau 1273: Partitioned into Mansfeld Elder Line and Mansfeld Younger Line
Mansfeld-Arnstein	County	Upp Sax	WT	1563: Partitioned from Mansfeld-Vorderort 1580: Mediatised; 3/5 to Saxony, 2/5 to Magdeburg 1615: Extinct; divided between Mansfeld-Artern, Mansfeld-Bornstedt, Mansfeld-Eisleben and Mansfeld-Friedeburg
Mansfeld-Artern	County	Upp Sax	WT	1563: Partitioned from Mansfeld-Vorderort 1580: Mediatised; 3/5 to Saxony, 2/5 to Magdeburg 1631: Extinct; divided between Mansfeld-Bornstedt and Mansfeld-Eisleben
Mansfeld-Bornstedt HRE Prince and Prince of Fondi, Count and Lord of Mansfeld, Noble Lord of Heldrungen, Seeburg and Schraplau, Lord of the Lordship of Dobrzisch, Neuhaus and Arnstein	County	Upp Sax	WT	1563: Partitioned from Mansfeld-Vorderort 1580: Mediatised; 3/5 to Saxony, 2/5 to Magdeburg 1780: Extinct; Saxon portion to Saxony, Magdeburgian portion to Magdeburg. Mansfeld property in the Habsburg domain to Austria 1789: Austrian fiefs to Colloredo-Mansfeld
Mansfeld-Eisleben	County	Upp Sax	WT	1563: Partitioned from Mansfeld-Vorderort 1580: Mediatised; 3/5 to Saxony, 2/5 to Magdeburg 1710: Extinct; to Mansfeld-Bornstedt
Mansfeld Elder Line	County	n/a	n/a	1273: Partitioned from Mansfeld 1313: Extinct; to Mansfeld Younger Line
Mansfeld-Friedeburg	County 1594: Principality	Upp Sax	WT	1563: Partitioned from Mansfeld-Vorderort 1580: Mediatised; 3/5 to Saxony, 2/5 to Magdeburg 1594: HRE Prince 1626: Extinct; divided between Mansfeld-Artern, Mansfeld-Bornstedt and Mansfeld-Eisleben
Mansfeld-Heldrungen	County	Upp Sax	WT	1563: Partitioned from Mansfeld-Vorderort 1572: Extinct; divided between Mansfeld-Arnstein, Mansfeld-Artern, Mansfeld-Bornstedt, Mansfeld-Eisleben and Mansfeld-Friedeburg
Mansfeld-Hinterort	County	Upp Sax	WT	1501: Partitioned from Mansfeld Line 1 1547: Under Imperial Ban 1552: Imperial Ban lifted 1560: Partitioned into Mansfeld-Hinterort Elder Line, Mansfeld-Hinterort Intermediate Line and Mansfeld-Hinterort Younger Line
Mansfeld-Hinterort Elder Line	County	Upp Sax	WT	1560: Partitioned from Mansfeld-Hinterort 1666: Extinct; divided between Mansfeld-Bornstedt and Mansfeld-Eisleben
Mansfeld-Hinterort Intermediate Line	County	Upp Sax	WT	1560: Partitioned from Mansfeld-Hinterort 1628: Extinct; to Mansfeld-Hinterort Elder Line
Mansfeld-Hinterort Younger Line	County	Upp Sax	WT	1560: Partitioned from Mansfeld-Hinterort 1594: Extinct; divided between Mansfeld-Hinterort Elder Line and Mansfeld-Hinterort Intermediate Line
Mansfeld Line 1	County	n/a	n/a	1420: Partitioned from Mansfeld Younger Line 1442: Acquired half of Friedeburg, and Salzmünde 1482: Acquired Heldrungen 1492: Extinct; to Mansfeld Line 2
Mansfeld Line 2	County	n/a	n/a	1420: Partitioned from Mansfeld Younger Line 1449/52: Acquired Artern 1501: Partitioned into Mansfeld-Vorderort, Mansfeld-Mittelort and Mansfeld-Hinterort
Mansfeld Line 3	County	n/a	n/a	1420: Partitioned from Mansfeld Younger Line 1442: Acquired half of Friedeburg 1499: Extinct; to Mansfeld Line 2
Mansfeld-Mittelort (Mansfeld-Schraplau)	County	Upp Sax	WT	1501: Partitioned from Mansfeld Line 1 1602: Extinct; to the lines of Mansfeld-Hinterort
Mansfeld-Vorderort	County	Upp Sax	WT	1501: Partitioned from Mansfeld Line 1 1563: Partitioned into Mansfeld-Bornstedt, Mansfeld-Eisleben, Mansfeld-Friedeburg, Mansfeld-Arnstein, Mansfeld-Artern and Mansfeld-Heldrungen 1580: Mansfeld-Vorderort mediatised; 3/5 to Saxony, 2/5 to Magdeburg
Mansfeld Younger Line	County	n/a	n/a	1273: Partitioned from Mansfeld 1420: Partitioned into Mansfeld Line 1, Mansfeld Line 2 and Mansfeld Line 3
Marchtal	Abbacy	Swab	SP	bef. 776: Formed 1500: Imperial immediacy 1803: To Thurn and Taxis 1806: To Württemberg
Mark (Marck)	1198: County	Low Rhen	PR	1226: Renamed from Altena-Berg 1299: Acquired Arenberg 1328: Partitioned into itself and Mark-Arenberg 1391: To Cleves 1394: To Cleves-Mark 1521: To Jülich-Cleves-Berg 1609: Extinct; War of Jülich Succession between Brandenburg and Palatinate-Neuburg 1614: To Brandenburg 1807: To France 1808: To Berg 1813: To Prussia
Mark-Arenberg (Marck-Arenberg)	County	Low Rhen	WE	1328: Partitioned from Mark 1454: Partitioned into itself and Mark-Rochefort 1547: To Ligne by marriage; who assumed the name Arenberg
Mark-Rochefort (Marck-Rochefort)	County	n/a	n/a	1454: Partitioned from Mark-Arenberg 1544: Extinct; to Louis of Stolberg-Stolberg, founder of line Stolberg-Rochefort
Mark-Schleiden (Marck-Schleiden)	County	Low Rhen	WE	1593: Philip of Marck inherited part of Manderscheid-Schleiden-Kerpen, assumed the name Mark-Schleiden 1774: Extinct; to Arenberg
Marmoutier (Maursmünster)	Abbacy	Upp Rhen	SP	by 659: Formed 659: Imperial immediacy 1648: To France 1789: Suppressed
Martinstein	Lordship	n/a	n/a	Formerly to Daun 1340: To the Archbishopric of Mainz 1353: Enfeoffed to Grasewege 1389: Enfeoffed to Merxheim c. 1555: Enfeoffed to Hunoltstein and Sickingen 1655: Sovereignty to Schönborn 1660: Enfeoffed to Weyers-Leyen and Ebersberg 1716: Sovereignty to Baden 1771: Ebersberg fief to Baden 1795: To France 1815: To Prussia
Massa and Carrara (Malaspina)	Marquisate 1568: Principality 1662: Duchy of Massa and Principality of Carrara	n/a	n/a	1473: Formed when Massa acquired Carrara 1568: HRE Prince 1664: HRE Duke 1796: To the Cispadane Republic 1797: To the Cisalpine Republic 1802: To Italy 1815: Restored 1829: To Modena and Reggio
Matsch	Barony	n/a	n/a	12th Century: Formed 1278: Acquired Tarasp 1344: Acquired Castels 1348: Lost Chiavenna, Puschlav and Bormio to Milan 1365?: Acquired Greifenstein 1372: Sold Malans to Underwegen 1394: Lost Greifenstein to the Bishopric of Chur 1400: Acquired Steinsberg 1421: Lost Advocacy of Marienberg and Müstair to the Tyrol 1464: Sold Tarasp to the Tyrol 1487: Under Imperial Ban 1496: Sold Castels to Austria 1504: Extinct; remaining territories to Trapp
Maulbronn	Abbacy	Swab	SP	1147: Established with imperial immediacy 1504: Made fief of Württemberg 1534: Abbey suppressed 1548: Abbey restored as fief of Württemberg 1807: Secularised and suppressed
Mechelen (Malines)	Lordship 1490: County (title remained "Lord")	Burg	n/a	910: Fief of Bishop of Liège 1333: To Flanders 1369: To Burgundy 1483: To the Burgundian Netherlands 1516: To the Spanish Netherlands 1713: To the Austrian Netherlands 1795: To France 1815: To the Netherlands 1830: To Belgium
Mecklenburg	Principality 1347: Duchy	n/a	n/a	1167: Obotrite prince became a vassal of Saxony, known then on in Germany as Mecklenburg 1180: Imperial immediacy 1234: Partitioned into itself, Werle, Rostock and Parchim-Richenberg 1255: Acquired Sternberg 1301: Acquired Wismar 1304: Acquired Stargard 1312: Acquired Rostock 1319: Acquired Prignitz and Uckermark 1325: Lost Prignitz and Uckermark 1347: HRE Duke 1352: Partitioned into Mecklenburg-Schwerin and Mecklenburg-Stargard
Mecklenburg-Grabow	Duchy	n/a	n/a	c. 1669: Appanage created in Mecklenburg-Schwerin 1747: Inherited Mecklenburg-Schwerin; appanage abolished
Mecklenburg-Güstrow	Duchy	Low Sax	PR	1480: Partitioned from Mecklenburg-Schwerin 1483: Extinct; to Mecklenburg-Schwerin 1520: Partitioned from Mecklenburg-Schwerin 1610: Extinct; to Mecklenburg-Schwerin 1621: Partitioned from Mecklenburg-Schwerin 1628-31: To Wallenstein 1695: Extinct in male line; succession dispute 1701: Ratzeburg and Stargard to Mecklenburg-Strelitz; rest to Mecklenburg-Schwerin
Mecklenburg-Mirow	Duchy	n/a	n/a	1658: Appanage created in Mecklenburg-Schwerin 1675: Extinct; to Mecklenburg-Schwerin
Mecklenburg-Schwerin Grand Duke of Mecklenburg, Prince of the Wendes, Schwerin & Ratzeburg, Count of Schwerin, Lord of the Lands of Rostock and Stargard	Duchy 1815: Grand Duchy	Low Sax	PR	1352: Partitioned from Mecklenburg 1358: Acquired Schwerin 1480: Partitioned into itself and Mecklenburg-Güstrow 1436: Acquired 1/3 of Werle 1520: Partitioned into itself and Mecklenburg-Güstrow 1552: Succession dispute 1556: Given to John Albert I, co-Duke of Mecklenburg-Güstrow 1621: Partitioned into itself and Mecklenburg-Güstrow 1628-31: To Wallenstein 1648: Acquired the Bishopric of Schwerin 1658: Appanage Mecklenburg-Mirow 1669: Appanage Mecklenburg-Grabow created 1815: Grand Duchy
Mecklenburg-Stargard	Duchy	n/a	n/a	1352: Partitioned from Mecklenburg 1408: Partitioned into Mecklenburg-Stargard-Sternberg and Mecklenburg-Stargard-Neubrandenburg 1438: Reunited by Mecklenburg-Stargard-Neubrandenburg 1471: Extinct; to Mecklenburg-Schwerin
Mecklenburg-Stargard-Neubrandenburg	Duchy	n/a	n/a	1408: Partitioned from Mecklenburg-Stargard 1436: Acquired 1/3 of Werle 1438: Renamed to Mecklenburg-Stargard
Mecklenburg-Stargard-Sternberg	Duchy	n/a	n/a	1408: Partitioned from Mecklenburg-Stargard 1436: Acquired 1/3 of Werle 1438: Extinct; to Mecklenburg-Stargard-Neubrandenburg
Mecklenburg-Strelitz Grand Duke of Mecklenburg, Prince of the Wendes, Schwerin and Ratzeburg, Count of Schwerin, Lord of the Lands of Rostock and Stargard	Duchy 1815: Grand Duchy	Low Sax	PR	1701: Created from Ratzeburg and Stargard from Mecklenburg-Güstrow for Adolphus Frederick II 1815: Grand Duke
Megen	County	n/a	n/a	1145: First mentioned; fief of Lower Lotharingia 1190: Imperial immediacy 1420: Extinct; to Dicbier 1469: To Brimeu 1610: To Croÿ 1666: To Velen 1697: To the Palatinate 1728: To Schall von Bell 1794: To France 1800: To the Batavian Republic 1806: To Holland 1810: To France 1815: To the Netherlands
Meissen	Bishopric	Upp Sax	EC	948: Formed 1180: Imperial immediacy 13th Century: HRE Prince of the Empire 1666: To Saxony
Meissen	Burgraviate	n/a	n/a	bef. 1006: First mentioned 1170: To Sterker von Wohlsbach 1199: To Werben c. 1350: To Werben-Hartenstein 1388: To Werben-Frauenstein 1426: Acquired by Plauen-Plauen who adopted the style 1466: Lost Plauen, Pausa, Gefell, and Graßlitz to Saxony 1572: Extinct; to Saxony
Meissen	Margraviate	n/a	n/a	965: Partitioned from the Marca Geronis 982: Acquired Merseburg and Zeitz 1002: Lost Lusatia 1247: Acquired Thuringia and the County Palatine of Saxony 1261: Partitioned into itself and Landsberg 1423: Purchased Saxony; henceforth Elector of Saxony
Memmingen	Imperial City	Swab	SW	1286: Free Imperial City 1802: To Bavaria
Mergentheim	Commandry of the Teutonic Order	Franc	EC	1058: First mentioned; property of Hohenlohe 1219: To the Teutonic Order 1527: Main seat of the Grandmaster of the Order 1805: HRE Prince 1809: To Württemberg
Merseburg	Bishopric	Upp Sax	EC	968: Formed 1004: HRE Prince of the Empire 1565: To Saxony 1656: To Saxe-Merseburg 1738: To Saxony 1815: To Prussia
Merseburg	Burgraviate	n/a	n/a	c. 920: to Goseck 1004: Title retained by Goseck but not the property
Merseburg	Margraviate	n/a	n/a	965: Partitioned from the Marca Geronis 982: Extinct; to the Margraviate of Meissen
Meßkirch (Messkirch)	Lordship	Swab	SC	1080: First mentioned; to Rohrdorf c. 1210: To Frederick of Waldburg who founded the line Waldburg-Rohrdorf c. 1300: To Waldburg-Meßkirch 1354: To Zimmern 1508: To Zimmern-Meßkirch 1594: To Helfenstein-Gundelfingen 1627: To Fürstenberg-Messkirch 1744: To Fürstenberg 1806: To Baden
Metz	Bishopric	Upp Rhen	EC	by 535: Established 945, 1047, 1152: Acquired Metzgau piecemeal 1065: Acquired Saarbrücken 1123: Lost Saarbrücken 1241: Lost Dagsburg 1558: Most to France 1632: All territory of the Bishopric to France 1648: Annexation to France formally recognised
Metz	Imperial City	Upp Rhen	RH	1189: Free Imperial City 1552: To France 1648: Annexation to France formally recognised
Michaelsberg (Siegberg)	Abbacy	Low Rhen	RP	1064: Formed 1512: Imperial immediacy 1676: To Palatinate-Neuburg 1685: To the Palatinate 1802: Suppressed
Mindelheim	Lordship 1714: Principality of Mindelheim and Schwabegg	Swab	SC / PR	1250: First mentioned by 1370: To Teck 1439: To Rechberg-Babenhausen 1467: Sold to Frundsberg 1591: Sold to Fugger-Kirchheim 1598: To Fugger-Glött 1616: To Bavaria 1704: To Churchill-Marlborough; HRE Prince 1714: To Bavaria
Minden	Bishopric	Low Rhen	see below	800: Formed 1180: Imperial immediacy; HRE Prince 1648: Secularized as a Principality for Brandenburg
Minden	Principality	Low Rhen	PR	1648: Secularized from the Bishopric of Minden for Brandenburg 1807: To Westphalia 1815: To Prussia
Moers (Mörs)	Lordship c. 1230: County 1706: Principality	Low Rhen	WE	c. 1160: First mention of Lords of Moers; fief of the Archbishopric of Cologne c. 1230: HRE Count 1288: Fief of Cleves 1385: Acquired Friemersheim 1399: Acquired Saarwerden by marriage 1417: Partitioned into itself and Moers-Saarwerden 1488: Seized by the Emperor 1493: To Wied-Runkel 1500: Returned to Moers 1501: Extinct; to Moers-Saarwerden 1510: To Wied-Runkel 1519: To Neuenahr-Bedburg 1584: To Spain 1597: To Neuenahr-Bedburg 1600: To Cleves 1601: To Maurice of Nassau-Orange; united with Nassau-Orange from 1618: Formed 1607: Imperial immediacy 1702: To Prussia 1794: To France 1815: To Prussia
Moers-Saarwerden	County	Upp Rhen	WE	1417: Partitioned from Moers 1527: Extinct; to Nassau-Saarbrücken
Mondsee	Abbacy	?	SP	748: Formed 788: Imperial immediacy 831: To the Bishopric of Regensburg 1142: Regained imperial immediacy 1506: Fief of Austria 1791: Suppressed
Mons (Bergen)	County	n/a	n/a	980: Partitioned from Hainaut 1071: Extinct; to Hainaut
Monschau (Montjoie)	Barony	n/a	n/a	1221: Mentioned as a property of Limburg 1226: To Limburg-Monschau 1262: To Valkenburg 1354: To Schönau-Schönforst 1433: To Jülich
Montbéliard (Mömpelgard)	County	Swab	PR	10th Century: First mentioned 1105: To Scarponnois 1163: To Montfaucon who assumed the title Montbéliard 1397: To Württemberg by marriage 1793: To France
Montechiarugolo	County			1180: Partitioned from Guastalla 1612: Acquired by the Duchy of Parma
Montfort	County	n/a	n/a	1180: Partitioned from Tübingen 1258: Partitioned into Montfort-Feldkirch, Montfort-Bregenz, Montfort-Tettnang, Werdenberg-Heiligenberg and Werdenberg-Sargans
Montfort-Bregenz	County	n/a	n/a	1258: Partitioned from Montfort c. 1290: Sigmaringen sold to Austria 1338: Extinct; to Montfort-Tettnang
Montfort-Bregenz-Bregenz	County	Swab	SC	1482: Partitioned from Montfort-Bregenz-Stadeck 1525: Sold to Austria 1550: Extinct
Montfort-Bregenz-Montfort	County	Swab	SC	1482: Partitioned from Montfort-Bregenz-Stadeck 1515: Extinct; to Montfort-Bregenz-Bregenz
Montfort-Bregenz-Peggau (Montfort-Bregenz-Beckach)	County	Swab	SC	1524: Renamed from Montfort-Bregenz-Pfannberg; fief of Styria 1574: Acquired territory of Montfort-Tettnang-Rothenfels 1581: Sold Liebenfels to Matthias Laymann 1592: Sold Wasserburg to Fugger-Weißenhorn 1576: Partitioned into Montfort-Bregenz-Peggau-Montfort, Montfort-Bregenz-Peggau-Tettnang and Montfort-Bregenz-Peggau-Peggau
Montfort-Bregenz-Peggau-Montfort (Montfort-Bregenz-Beckach-Montfort)	County	Swab	SC	1576: Partitioned from Montfort-Bregenz-Peggau 1590: Extinct; to Montfort-Bregenz-Peggau-Tettnang
Montfort-Bregenz-Peggau-Peggau (Montfort-Bregenz-Beckach-Beckach)	County	n/a	n/a	1576: Partitioned from Montfort-Bregenz-Peggau 1596: Sold Peggau 1617: Extinct
Montfort-Bregenz-Peggau-Tettnang (Montfort-Bregenz-Beckach-Tettnang)	County	Swab	SC	1576: Partitioned from Montfort-Bregenz-Peggau 1657: Acquired Schomburg 1764: Liebenau sold to Weingarten Abbey 1780: Sold to Austria 1787: Extinct
Montfort-Bregenz-Pfannberg	County	Swab	SC	1423: Partitioned from Montfort-Tettnang-Bregenz Elder Line 1437: Extinct; to Montfort-Bregenz-Stadeck 1482: Partitioned from Montfort-Bregenz-Stadeck 1524: Sold Pfannberg to Styria; renamed to Montfort-Bregenz-Peggau
Montfort-Bregenz-Stadeck	County	n/a	n/a	1423: Partitioned from Montfort-Tettnang-Bregenz Elder Line 1482: Partitioned into Montfort-Bregenz-Bregenz, Montfort-Bregenz-Pfannberg and Montfort-Bregenz-Montfort
Montfort-Feldkirch	County	n/a	n/a	1258: Partitioned from Montfort 1302: Partitioned into itself and Montfort-Tosters 1375: Sold to Austria 1390: Extinct
Montfort-Tettnang	County	n/a	n/a	1258: Partitioned from Montfort 1287: Sold Scheer to Austria 1314: Acquired Scheer and Friedberg 1331: Acquired Rothenfels 1354: Partitioned into Montfort-Tettnang-Tettnang and Montfort-Tettnang-Bregenz
Montfort-Tettnang-Bregenz	County	n/a	n/a	1354: Partitioned from Montfort-Tettnang 1362: Acquired Pfannberg 1379: Partitioned into Montfort-Tettnang-Bregenz Elder Line and Montfort-Tettnang-Bregenz Younger Line
Montfort-Tettnang-Bregenz Elder Line	County	n/a	n/a	1379: Partitioned from Montfort-Tettnang-Bregenz 1423: Partitioned into Montfort-Bregenz-Pfannberg and Montfort-Bregenz-Stadeck
Montfort-Tettnang-Bregenz Younger Line	County	n/a	n/a	1379: Partitioned from Montfort-Tettnang-Bregenz 1458: Sold to Austria
Montfort-Tettnang-Langenargen	County	n/a	n/a	1439: Partitioned from Montfort-Tettnang-Tettnang 1445: Extinct; to Montfort-Tettnang-Rothenfels
Montfort-Tettnang-Rothenfels	County	Swab	SC	1439: Partitioned from Montfort-Tettnang-Tettnang 1567: Rothenfels sold to Königsegg-Aulendorf 1574: Extinct; to Montfort-Bregenz-Peggau
Montfort-Tettnang-Tettnang	County	Swab	SC	1354: Partitioned from Montfort-Tettnang 1386: Acquired Wasserburg 1399: Acquired Oberstaufen 1414: Scheer and Friedberg to Zillenhard 1420: Acquired Bludenz 1437: Acquired Davos and Prättigau 1439: Partitioned into itself, Montfort-Tettnang-Rothenfels and Montfort-Tettnang-Langenargen 1526: Extinct; to Montfort-Tettnang-Rothenfels
Montfort-Toggenburg	County	n/a	n/a	1436: Henry V of Montfort-Tettnang-Tettnang obtained part of Toggenburg 1483: Extinct; to Montfort-Tettnang-Tettnang
Montfort-Tosters	County	n/a	n/a	1302: Partitioned from Montfort-Feldkirch 1359: Extinct; to Montfort-Feldkirch
Mosbach	Imperial City	n/a	n/a	1241: Free Imperial City 1297: To Breuberg 1367: To the Palatinate 1410: To Palatinate-Mosbach 1448: To Palatinate-Mosbach-Neumarkt 1499: To the Palatinate 1803: To Leiningen 1806: To Baden
Mühlhausen	Imperial City	Low Sax	RH	1251: Free Imperial City 1802: To Prussia 1807: To Westphalia 1815: To Prussia
Mulhouse (Mülhausen)	Imperial City	Upp Rhen	RH	1275: Free Imperial City 1437: Acquired Illzach and Modenheim 1515: Ally of the Swiss Confederation 1648: Left the Empire as a Swiss ally 1798: To France
Münchenroth (Mönchsrot) See: Rot an der Rot	Abbacy
Münster (Munster)	Bishopric	Low Rhen	EC	c. 795: Formed 1122: Acquired Kappenberg as fief of Saxony 1134: HRE Prince of the Empire c. 1170: Acquired Stromberg as fief of Saxony 1180: Imperial immediacy 1252: Acquired Vechta 1269: Acquired Horstmar 1400: Acquired Ahaus 1803: Secularized and divided between Prussia, Arenberg, Looz-Corswarem, Salm-Kyrburg, Salm-Salm and Croÿ
Munster (Münster im Gregoriental)	Imperial City	Upp Rhen	RH	1354?: Free Imperial City 1648: To France
Murbach	Abbacy	Upp Rhen	RP	722: Formed 792: Imperial immediacy 1648: To France 1789: Secularised
Muri	Abbacy	n/a	n/a	1027: Formed Abbey never held immediate territory 1648: To Switzerland 1701: HRE Prince of the Empire
Myllendonk (Millendonk)	Lordship	Low Rhen	WE	1166: First mentioned 1268: Made fief of Guelders 1279: Fief of the Archbishopric of Cologne 1297: Sold to Reifferscheid-Myllendonk as fief of Cologne c. 1300: Extinct 1346/50: To Myllendonk-Mirlaer as fief of Cologne 1612: To Bronckhorst-Batenberg as fief of Cologne 1641: To Croÿ-Myllendonk as fief of Cologne 1683: To Croÿ as fief of Cologne 1694: To Berlepsch as fief of Cologne 1700: To Ostein; imperial immediacy, Lower Rhenish-Westphalian Circle 1794: To France 1815: To Prussia

List of states in the Holy Roman Empire

• A
• B
• C
• D
• E
• F
• G
• H
• I
• J
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Free Imperial Cities, Imperial abbeys, Imperial Knights, Imperial Villages