Hierarch Peter, Bishop of Sebastea

CLARIFICATION ON CHARITABLE WORK: the established assumption that Peter of Sebastea personally founded a hospital/poorhouse is not supported by sources — the famous "Basiliad" complex (hospital, hospice, leprosarium) was built by his brother, St. Basil the Great, in Caesarea, not by Peter himself in Sebastea. What is genuinely attested is a different act of mercy: during a severe famine in Pontus and Cappadocia, Peter distributed his monastery's own goods to the starving — this detail replaces the inaccurate mention of "hospital-founding."

Saint Peter, Bishop of Sebastea (c. 340–391/392), was the youngest of the ten children of Saints Basil the Elder and Emmelia of Cappadocia, and the youngest brother of Saints Basil the Great and Gregory of Nyssa, and of St. Macrina the Younger, who took a leading role in shaping his spiritual formation. Following his elder siblings' example, he embraced monastic asceticism; around 365 he became abbot of the men's monastery Basil had founded on the Iris River, succeeding him.

During a severe famine in Pontus and Cappadocia, Peter gave away his monastery's own provisions to relieve the starving, and later the deaconess Olympias entrusted him with substantial funds for further distribution to the poor. Ordained presbyter by Basil, he was consecrated Bishop of Sebastea in Armenia around 380.

In 381 he attended the Second Ecumenical Council in Constantinople, standing with his brothers against Arianism and Macedonianism. He died in 391 (some sources say 392). His feast is kept on January 9/22, and also on the Sunday after Theophany together with the rest of his sainted family.