The History of Abba Ammon
Arsisius tells Palladius of the monk Ammon, who was orphaned at age twenty-two and compelled to marry. He and his wife lived for eighteen years as brother and sister, and then parted ways to both become monastics. Ammon at this time departed to Nitria, where there were yet no monasteries, and became a founder of monasticism in that region.
Palladius reports a story from St. Athanasius' history of Abba Anthony, of a time when Abba Ammon needed to cross a river called "the Wolf" and was carried over by an angel.