Sixth century traveler and geographer, born Alexandria, Egypt. He explored the region south of Egypt as far as Cape Guardafui and east probably as far as India (Indicopleustes = voyager to India). On retiring from his travels he entered the monastery of Raithu on the Peninsula of Sinai. Here he wrote his "Christian Topography," an account of his travels and investigations with a description of the universe as he imagined it, and with explanatory maps. The work is valuable as being the first effort of patristic geography.