Historical Context
John's life unfolded in fifth-century Constantinople, the imperial capital and a major center of early Byzantine monasticism. The monastery he entered, that of the Akoimetoi ('the Unsleeping Ones'), was an ascetic community noted for maintaining perpetual liturgical prayer in continuous shifts; the sources associate John's tonsure and formation with this community and name its igumen as Saint Marcellus.
Sources differ on the monastery's location: the OCA account places the monastery of the Unsleeping Ones in Bithynia, while older Western accounts describe John leaving home to become a monk farther afield. Both traditions agree that he belonged to the Akoimetoi community and spent roughly six years there before his return.