Bayt al-Ḥikma (‘House of Wisdom’), or Khizānat al-Ḥikma (‘Store-house of Wisdom’), was a library in Baghdad that functioned during the ʿAbbāsid era from the end of Hārūn al-Rashīd’s rule (r. 170–194/786–809) through al-Maʾmūn’s reign (r. 198–218/813–833) and up to the time of al-Muʿtaṣim (r. 218–227/833–84…