Wadi El Natrun
It was Pachomius the Great who developed the idea of cenobitic monasticism: having renunciates live together and worship together under the same roof. Some attribute his mode of communal living to the barracks of the Roman Army in which Pachomios served as a young man. Soon the Egyptian desert blossomed with monasteries, especially around Nitria (Wadi El Natrun), which was called the "Holy City". Estimates are that upwards of 50,000 monks lived in this area at any one time. Hermitism never died out though, but was reserved only for those advanced monks who had worked out their problems within a cenobitic monastery.