The Great Mosque of Sana'a (Arabic: الجامع الكبير بصنعاء‎, al-Jāmiʿ al-Kabīr bi-Ṣanʿāʾ) is an ancient mosque in Sana'a, Yemen, and one of the oldest mosques in the world.[1] The mosque is said to have been founded in the early Islamic period, suggested to be in 633.[2][3][4][5] While the precise date of construction is unknown, the earliest recorded renovations occurred under Caliph al-Walid I in the early 8th century, implying a possible earlier date of construction.[4] The mosque was reportedly built in part from spolia from the Himyarite-era Ghumdan Palace and from the Axumite Christian Church of al-Qalis that formerly occupied the site.[1][4] The Great Mosque is the largest and most notable of over one hundred mosques in the Old City of Sana’a.[3]