dated 778, is the work of " John, the anchorite of Beth Mari Qanon, a monastery of Ma'arrath Meven city in the district of Antioch." Source - yourdictionary.com

The writing of the Sinaitic ms. is dated to 778 AD (fol. 181v) and consists of a collection of twelve lives of female saints. What survives today are 182 vellum folios. The quires oddly are numbered in a double format: Syriac letters running right to left and Georgian signatures running in the opposite direction. The scribe responsible for the later writing gives his name three times as John the anchorite of Beth Mari Qanon, a monastery of Ma’arrath Mesrên, a small town roughly equidistant between Antioch and Aleppo.
Source - gospelmanuscripts.wordpress.com