who is given credit for writing the rules of behavior for the monks living in the monasteries
Christian monasticism Saint 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.