| Reign |
Name |
| 1291–1292 |
William I |
| 1292–1318 |
Albert the Fat (1268–1318) |
| 1318–1344 |
After the death of Albert his sons Otto the Mild, Ernest and Magnus divided the princedom. After Otto died without issue in 1344, his two brothers Ernest and Magnus divided the estate between them: Ernest received the Land of Oberwald with Göttingen, whilst Magnus the Pious took over the reins of power in Brunswick-Wolfenbüttel. |
| 1344–1369 |
Magnus the Pious (1304–1369) |
| 1369–1373 |
Magnus Torquatus (the Lüneburg War of Succession of 1370-88 began under him; it was continued by his sons Frederick and Bernard). |
| 1373–1400 |
Frederick; following the murder of Frederick near Fritzlar in 1400 there was a period of joint rule by Bernard and Henry |
| 1400–1409 |
Henry the Mild (d 1416); founded the Middle House of Brunswick, which his nephews, William I and Henry, initially divided. |
| 1400–1428 |
Bernard, inherited Lüneburg and founded the House of Hanover |
| 1416–1482 |
William I (d 1482) |
| 1482–1491 |
William II (d 1503) |
| 1491–1514 |
Henry the Elder (1463–1514), the Friedfertige |
| 1514–1568 |
Henry the Younger (1489–1568); - under him the medieval fortress (Burg) was rebuilt into a castle (Schloss); he was a passionate opponent of the Lutherans, and driving force behind the Catholic alliance established against the Schmalkaldic League; the disinheritance of a third son could not be carried out |
| 1568–1589 |
Julius (1528–1589); - a great builder of the town, who from the fortress created the first systematically laid out Renaissance town; in 1572 he founded the library, whose present name goes back to its most important collect, Duke August the Younger; he also founded the university in Helmstedt in 1576 and built the castle of Hessen; in the early 16th century he reinforced the bastions into a fortress; he purchased Kalenberg, Göttingen and Diepholz; Julius was a Protestant |
| 1589–1613 |
Henry Julius (1564–1613) - it was the cultural heyday in Wolfenbüttel; Henry Julius was the Bishop of Halberstadt, the rector of the University of Helmstedt, the president of the manorial court, an alchemist, hunter and author |
| 1613–1634 |
Frederick Ulrich (1591–1634) |
| The Wolfenbüttel line of the Middle House of Brunswick died out in 1634. The title was transferred to the middle branch of the House of Lüneburg (New House of Brunswick) |
| 1635–1666 |
Augustus the Younger of Brunswick-Lüneburg (1579–1666) - in 1643 he moved into the Residence at Wolfenbüttel, was the founder of a barock theatre and the Bibliotheca Augusta |
| 1666–1704 |
Rudolf Augustus (1627–1704) according to reports dating to 1677, he slashed a way through the Lechlum Forest, the Alten Weg ("Old Way"), later the "Barock Road" between the Lustschloss of Antoinettenruh via the little barock castle [later the Sternhaus] to the Großes Weghaus at Stöckheim; in 1671 he captured the town and fortress of Brunswick |
| 1685–1714 |
Anthony Ulrich (1633–1714) - Anton Ulrich was a politician, art lover and poet; founder of the museum named after him in Brunswick; he had Salzdahlum Castle built |
| 1714–1731 |
Augustus William (1662–1731) |
| 1731–1735 |
Louis Rudolph (1671–1735) |
| The Wolfenbüttel line died out. The title was transferred to the collateral line of Brunswick-Bevern |
| 1735 |
Ferdinand Albert II (1680–1735) |
| 1735–1780 |
Charles I (1713–1780) - founder of the Collegium Carolinum in Brunswick, the porcelain makers of Fürstenberg, the fire office; in 1753 the Residence was moved to Brunswick |
| 1780–1806 |
Charles II William Ferdinand (1735–1806) - he was the head of the Prussian Army; died in the Battle of Jena; because his son and heir died young, and two other sons were not eligible, rule passed to his youngest son: |
| 1806–1807 |
Frederick William (1771–1815); Duke of Oels/Silesia, the "Black Duke"; recruited a Freikorps (volunteer corps), the Black Brunswickers, at the outbreak of the War of the Fifth Coalition in Bohemia in 1809, and made his way via Brunswick to the North Sea and then on to Great Britain. |
| 1807–1813 |
occupied by the French (Kingdom of Westphalia) |
| In 1814 reformed as the: Duchy of Brunswick |
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