Sasima is mentioned in only three non-religious documents: "Itiner. Anton.", 144; "Itiner. Hiersol.", 577; Hierocles, 700, 6. The very small town is known for being the first see of St. Gregory of Nazianzus who was appointed to it by his friend St. Basil as an aspect of Basil's conflict with Anthimus. Gregory was there only briefly, if at all. Anthimus, bishop of Tyana, had claimed status as an archbishop and jurisdiction over Sasima after the Emperor Valens divided Cappadocia into two parts. Anthimus appointed a competing claimant bishop for Sasima to whom Gregory effectively ceded the town. All the Greek Notitiae episcopatuum consider Sasima part of Cappadocia Secunda, as does the Annuario Pontificio, making it a suffragan of Tyana.
Sasima may be the modern Turkish village of Zamzama or that of Hasaköy.
- Sophrone Pétridès, "Sasima" in Catholic Encyclopedia (New York 1912)
- Annuario Pontificio 2013 (Libreria Editrice Vaticana, 2013, ISBN 978-88-209-9070-1), p. 964