Cappadocia, in 370, he promoted his brother Peter to the priesthood; the holy abbot looked on the holy orders he had received as a fresh engagement to perfection. His brother St. Basil died on the 1st of January, in 379, and his sister Macrina in November, the same year. Eustathius, bishop of Sebaste, in Armenia, a violent Arian, and a furious persecutor of St. Basil, seems to have died soon after them, for St. Peter was consecrated bishop of Sebaste in 380, to root out the Arian heresy in that diocese, where it had taken deep root; the zeal of a saint was necessary, nor can we doubt but God placed our saint in that dignity for this purpose. A letter which St. Peter wrote, and which is prefixed to St. Gregory of Nyssa's books against Eunomius, has entitled him to a rank among the ecclesiastical writers, and is a standing proof, that though he had confined himself to sacred studies, yet by good conversation and reading, and by the dint of genius, and an excellent understanding, he was inferior to none but his incomparable brother Basil, and his colleague Nazianzen, in solid eloquence. In 381, he attended the general council held at Constantinople, and joined the other bishops in condemning the Macedonian heretics. Not only his brother St. Gregory, but also Theodoret, and all antiquity, bear testimony to his extraordinary sanctity, prudence, and zeal. His death happened in summer, about the year 387, and his brother of Nyssa mentions, that his memory was honored at Sebaste (probably the very year after his death) by an anniversary solemnity, with several martyrs of that city.[1] His name occurs in the Roman Martyrology, on the 9th of January. * * * * *