 Guy and others, and consensus (such as there is) has shifted to a 7th Century provenance.If Daniel's "Vita" is trustworthy (there is nothing against which to judge its accuracy), then John came to the "Vatos" Monastery at Mount Sinai, now Saint Catherine's Monastery, and became a novice when he was about 16 years old.He was taught about the spiritual life by the elder monk Martyrius.