Greek monastic author of uncertain identity. He is said to have been a disciple of St. John Chrysostom and to have lived in Galatia, perhaps also spending some time in the desert of Judaea, though his identity and date remain very uncertain (thus it has also been suggested that he was another person of that name, from Tarsus, with whom Severus corresponded; this would put him a century later). His Greek writings are now available in a good edition (G.-M. de Durand, in SC 445, 455 [1999, 2000]); most of these were translated into Syriac (where the oldest ms., dated 533/4, calls him ‘Mark the Egyptian Solitary’). His writings were evidently quite widely read in E.-Syr. monastic circles; further testimony to their popularity is the existence of commentary on his ‘On the Spiritual Law’ ( CPG 6090), by Babai the Great (died 628). None of the Syriac translations have yet been edited. Arabic versions of several of the works were made from Syriac (ed. I. A. Khalifé, in MUSJ 28 [1949–50], 117–224).