Basil wrote a series of guides for monastic life (the Lesser Asketikon the Greater Asketikon the Morals, etc.) which, while not "Rules" in the legalistic sense of later Western rules, provided firm indications of the importance of a single community of monks, living under the same roof, and under the guidance—and even discipline—of a strong abbot. His teachings set the model for Greek and Russian monasticism but had less influence in the Latin West. Of great importance to the development of monasticism is the Saint Catherine's Monastery on Mount Sinai in Egypt. Here the Ladder of Divine Ascent was written by Saint John Climacus (c.600), a work of such importance that many Orthodox monasteries to this day read it publicly either during the Divine Services or in Trapeza during Great Lent. At the height of the East Roman Empire, numerous great monasteries were established by the emperors, including the twenty "sovereign monasteries" on the Holy Mountain, an actual "monastic republic" wherein the entire country is devoted to bringing souls closer to God. In this milieu, the Philokalia was compiled. As the Great Schism between East and West grew, conflict arose over misunderstandings about Hesychasm. Saint Gregory Palamas, bishop of Thessalonica, an experienced Athonite monk, defended Eastern Orthodox spirituality against the critiques of Barlaam of Calabria, and left numerous important works on the spiritual life. Present Christian monasticism was and continued to be a lay condition—monks depended on a local parish church for the sacraments. However, if the monastery was isolated in the desert, as were many of the Egyptian examples, that inconvenience compelled monasteries either to take in priest members, to have their abbot or other members ordained. A priest-monk is sometimes called a hieromonk. In many cases in Eastern Orthodoxy, when a bishopric needed to be filled, they would look to nearby monasteries to find suitable candidates, being good sources of men who were spiritually mature and generally possessing the other qualities desired in a bishop. Eventually, among the Eastern Orthodox Churches, it became established by canon law that all bishops must be monks. Monastic centers thrive to this day in Bulgaria, Ethiopia, Georgia, Greece, North Macedonia, Russia, Romania, Serbia, the Holy Land, and elsewhere in the Orthodox world, the Autonomous Monastic State of Mount Athos remaining the spiritual center of monasticism for the Eastern Orthodox Church. Since the fall of the Iron Curtain, a great renaissance of monasticism