Amr Ibn Al-Ass Mosque

Amr Ibn Al-Ass Mosque
  Location:
The tomb is located in Fustat , the temporary city founded by Amr, and was an Islamic learning center long before El-Azhar Mosque. It could hold up to 5,000 students. in Cairo
Who built it? 
The mosque was erected in 642 AD (21 AH) by Amr Ibn al'As, the commander of the Muslim army that conquered Egypt
Why was it built? 
Normally any mosque is built for religious reason, but Amr Mosque was not merely a place of worship but also served as a court for settling religious and civil disputes. Moreover, teaching circles were organized either for general religious preaching or teaching lessons in Quranic sciences, jurisprudence and Prophet Muhammad's Tradition (Hadith) as well as letters. 
Explanation:
The mosque is considered the first and oldest mosque ever built on the land of Egypt. Erected in 642 AD (21 AH) by Amr Ibn al'As, the commander of the Muslim army that conquered Egypt. The mosque is said to have been built on the site of Amr Ibn el-As's tent at Fustat , is the oldest existing mosque, not just in Cairo, but the entire African Continent and was an Islamic learning center long before El-Azhar Mosque. It could hold up to 5,000 students. The mosque was originally built on an area of 1,500 square cubits, overlooking the Nile
The mosque area remained unchanged until 672 AD (53 AH), when Musallama al-Ansari, Egypt's ruler on behalf of Caliph Mu'awiya Ibn abi-Sufian undertook expansion and renovation works for the mosque. Walls and ceilings were decorated and four compartments for "muezzins" (callers for prayers) were added at the corners, together with a minaret, while the mosque ground was covered with straw mats