The Khuld Palace (Arabic: قصر الخلد, romanized: Qaṣr al-Khuld, lit.
[1] In 773,[2] al-Mansur began construction of another palace on an elongated, mile-long stretch of land between the walls of the Round City and the western bank of the Tigris River.
[2][4] It was named "Palace of Eternity" (Qaṣr al-Khuld) from a passage in the Quran alluding to Paradise, the "Palace of Eternity promised to the God-fearing", because its gardens were said to almost rival the garden of Paradise.
[5] According to Ya'qubi, before the palace was a large review ground, adjacent to the royal stables.
[6] While the Palace of the Golden Gate was the official caliphal residence, after the Khuld Palace was inaugurated in 775 al-Mansur as well as his successors up to Harun al-Rashid (r. 786–809) frequently used both residences, with Harun reportedly favouring the Khuld during his stays in Baghdad.