Prophet's Mosque

It was built during the Hegira of Muhammad and his companions from Mecca to Medina. A few days after starting construction of the Quba Mosque, Muhammad began construction of a second place of worship in Medina, known today as the Masjid al-Nabawi, or the “Prophet's Mosque”. The location of the mosque was chosen based on where the first Friday prayer was performed in the city. An oral tradition also relates a legend according to which, Muhammad resuming his way to Medina, left his mount, a dromedary named Qoçoua, to determine the place of arrival by releasing the bridle. So after many detours, she finally came to a stop on a large empty lot and knelt down. It is on this land that the Mosque of Medina was built1 [ref. to confirm].
The first expansion of the mosque took place under the reign of Caliph Omar ibn al-Khattab who added a portion of land to the mosque on the north side and rebuilt it. When Caliph Omar died, he was buried next to the tombs of Muhammad and Caliph Abu Bakr As-Siddiq. During the reign of Caliph Uthman ben Affan, the enlargement of the mosque seemed necessary and urgent. He then proceeded, in 649-650, to the extension and reconstruction of the mosque.