Origins and Monastic Life
David was descended from the Kydonians of the town of Aivali (Greek: Kydonies) in Asia Minor. According to the sources, the inhabitants of this town held a special relationship with Mount Athos, owing to Athonite dependencies and embassy churches connected to their city; one account associates these ties with the monasteries of Iveron and Pantokratoros.
He became a monk at the Skete of Saint Anna on Mount Athos, a hermitage-style community attached to the Great Lavra and situated on the Aegean shore, where he joined a compatriot already living there.