Nilus of Sinai

Nilus of Sinai — also known as Nilus of Ancyra — was a fifth-century Greek ascetic writer, monastic leader, and correspondent whose vast letter collection made him one of the most widely consulted spiritual guides of the patristic East. A disciple of John Chrysostom in Constantinople, where he served as eparch (praetorian prefect) of the city, he renounced public life for the monastic vocation sometime between 390 and 404, eventually becoming abbot of a monastery near Ancyra in Galatia. His authentic works — including the Ascetic Discourse preserved in the Philokalia and the treatises On Voluntary Poverty and Peristeria — reflect a sober Evagrian spirituality that shaped the later hesychast tradition of Byzantine monasticism. Modern scholarship has clarified that the celebrated treatise On Prayer long circulating under his name is the work of Evagrius Ponticus, and the Narrationes (the account of a Saracen raid on Sinai monks attributed to him) is widely regarded as a later pious fiction composed by Pseudo-Nilus rather than genuine autobiography. He stands as a key transmitter of Evagrian ascetic theology to the Byzantine tradition and to the compilers of the Philokalia.