Many settlements in Cappadocia were established primarily as monastic communities. As Bishop of Caesarea Mazaca in the 4th century, St. Basil the Great wrote the rules for monastic life that are still followed by monks and nuns of the Greek Orthodox Church. He advocated community life, prayer and physical labor rather than the solitary asceticism that was popular at the time and it was under his guidance that the first churches were built in Goreme Valley. Here, a number of small communities with their own churches formed the large monastic complex that is now the Open Air Museum. Hundreds of churches are reported to have been built in this valley but no churches from St. Basil's time remain. In Goreme, the Tokali Kilise or the "Buckle Church" is easily the loveliest of the churches with graceful arches and beautiful frescoes.