Discipleship under Saint Paisius of Uglich
Bassian's monastic life began under Saint Paisius of Uglich (reposed June 6, 1504), the founder and abbot of the Pokrov (Protection) Monastery near Uglich. Bassian received his tonsure from Paisius and lived for roughly twenty years within that community.
He stands among the known disciples of Saint Paisius, a circle that also included Saints Adrian and Bogolep of Uglich in the late fifteenth century, situated in the same monastic tradition of the Uglich lands.
The Pokrovsky Paisiev Monastery later suffered greatly during the Time of Troubles: in 1609 its abbot Anthony, forty monks, and over a thousand laymen were killed there.