Rear Palace

Krom Phra Ratchawang Bowon Sathan Phimuk (Thai: กรมพระราชวังบวรสถานพิมุข), or colloquially Rear Palace (Thai: วังหลัง) was the next position down the hierarchy from Krom Phra Ratchawang Bowon Sathan Mongkhon, or the Front Palace. The first appointment to this position occurred during the Ayutthaya period, in the reign of Phra Maha Thammarachathirat. He built a palace for his younger son Somdej Phra Ekathotsarot, the younger brother of Naresuan the Great. This is the origin of the term "Rear Palace", but at the time there was no special rank attached to it. Later, King Narai the Great sent his younger brother Phra Traibhuvanatthidtayawong to live in the rear palace, but still no special rank was added.

Deputy Viceroy of Siam
กรมพระราชวังบวรสถานพิมุข
Longest reigning Anurak Devesh circa 1782–20 December 1806
Style	His Royal Highness
Type	Heir presumptive Deputy uparaja
Residence	Rear Palace
Appointer	Monarch
Term length	Life tenure or until accession as Viceroy
Formation	circa 1688 (337 years ago) (1688)
First holder	Chopkhotchaprasit
Final holder	Anurak Devesh
Abolished	20 December 1806 (218 years ago) (1806-12-20)
Unofficial names	Rear Palace, วังหลัง

Upon the ascension of Somdej Phra Pethracha, Luang Sorasak was appointed as Front Palace and Nai Chopkhotchaprasit was appointed as Rear Palace. Both of them received royal commands, which is the true beginning of the political importance of the titles. Later, during the reign of Somdej Phra Sanphet VIII (or Phra Chao Suea), Chao Fa Phet, his eldest son, was appointed to the office of Krom Phra Ratchawang Boworn Sathan Mongkol or Phra Banthoon Yai, and Chao Fa Phon, his youngest son, was made the Krom Phra Ratchawang Boworn Sathan Phimuk or Phra Banthoon Noi.^[1]

List of Rear Palace lords

Ayutthaya

Rear Palace	Appointed by	Reign
Chopkhotchaprasit	Phetracha	circa 1688–?
Borommakot	Sanpet VIII	circa 1703–1708

Rattanakosin

Rear Palace	Appointed by	Reign
Anurak Devesh	Phutthayotfa Chulalok (Rama I)	circa 1782–1806