**ISAAC, St. – Abbot of Constantinople, lived in the 4th century and died between 406 and 425. He founded the first monastery in Constantinople and had as a disciple St. Dalmatius (q.v.). He defended the cause of the faith against the Arians during the reign of Valens. Feast day: May 30.**
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**ISAAC, St. – Abbot of Monteluco. Originally from Syria, he came to Italy in the first half of the 6th century to escape the intrigues of the Monophysites. Having settled on Monteluco near Spoleto, he first led a solitary life, then founded a monastery according to the system of the Palestinian lauras, which, however, after his death, adopted the Rule of St. Benedict.**
He was renowned for his life of prayer, for healing the sick, for freeing the possessed, and for his prophetic spirit. His relics are preserved in Spoleto and his feast is celebrated on April 11.
Some writings, particularly 63 Sermons, are attributed to him, but these are by others, perhaps by Isaac of Antioch, who lived in the 5th century.
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