Saint Macarius of Egypt first came to Scetis (Wadi El Natrun) around 330 AD where he established a solitary monastic site. His reputation attracted a loose band of anchorites, hermits and monks who settled nearby in individual cells. Many of them came from nearby Nitria and Kellia where they had previous experience in solitary desert living; thus the earliest cenobitic communities were a loose consolidation of like-minded monks. By the end of the fourth century, four distinct communities had developed: Baramus, Macarius, Bishoi and John Kolobos. At first these communities were groupings of cells centered on a communal church and facilities, but enclosed walls and watchtowers developed over time and in response to raids from desert nomads. Nitria, Kellia, and Scellis also experienced internal fractures related to doctrinal disputes in Egypt. At its peak the place contained 700 monasteries. The monasteries flourished during the Muslim conquest of Egypt (639-42), but in the eighth and ninth centuries taxation and administration concerns led to conflicts with the Muslim government. Nitria and Kellia were eventually abandoned in the 7th and 9th centuries respectively, but Scetis continued throughout the Medieval period. Although some of the individual monasteries were eventually abandoned or destroyed, four have remained in use to the present day: