Rear Palace
Krom Phra Ratchawang Bowon Sathan Phimuk (Thai: กรมพระราชวังบวรสถานพิมุข), colloquially the Rear Palace (Thai: วังหลัง, RTGS: Wang Lang), ranked immediately below the Krom Phra Ratchawang Bowon Sathan Mongkhon or Front Palace. The position first emerged in the Ayutthaya period under King Maha Thammaracha, who built a palace to the rear of the main royal palace for his younger son, Prince Ekathotsarot, the younger brother of King Naresuan.