^The official site for the Abbey of Grottaferrata gives September 26.
^"After a carefree youth in the south of Italy, he became a monk at the monastery of St Adrian in Calabria, where he later became abbot. In 981 the invading Saracens drove the monks to Vellelucio, where they lived on land given to them by the monastery of Monte Cassino. Shortly before his repose, Nilus designated that as the place where his monastery was to be definitively established. This monastery, of Grottaferrata, was for long faithful to Ortodoks."
David Paul Hester. Monasticism and Spirituality of the Italo-Greeks.Volume 55 of Analekta Vlatadōn. Patriarachal Institute for Patristic Studies [Patriarchikon Hidryma Paterikon Meleton], 1992. pp. 200–221.