The White House (al-Dar al-Bayda'), al-Fustat

Ibn Abd al-Hakam says that Abd al-Rahman ibn Udays al-Balawi laid out the White House; others say it was an open court in front of the mosque and the house of Amr ibn al-As, where the Muslims' horses stood at the mosque door. ¹

When Marwan ibn al-Hakam came to Egypt in the year 65 he built it as his own house, saying a caliph should not be in a land where he had no house, and it was built for him in two months. ¹ An addition in one manuscript says it was built in forty days and that it collapsed all at once in the days of al-Mahdi, a full hundred years later. ¹