Saint Isaac the Great, also known as Sahak and Parthev, was born in 338, the son of Saint Nerses the Great, Catholicos of Armenia.
Left an orphan at a very early age, he received in Constantinople an excellent education, particularly in the Eastern languages. He was a married layman for several years. When he wife died he became a monk, succeeding his father as Catholicos (Patriarch) of Armenia in 390. He secured recognition from Constantinople of the status, rights and independence of the Armenian Church. From his position he worked to reform the Armenian Church, evangelize the Armenian people, and establish an Armenian identity. Through Isaac’s efforts the churches and monasteries destroyed by the Persians were rebuilt, education was cared for in a generous way, the pagan worship of Ormuzd which Shah Yezdigerd tried to set up was cast out, and three councils held to re-establish ecclesiastical discipline. He was also noted for his ascetic life.
Isaac worked with Saint Mesrop the Teacher to evangelize Armenia, and to develop an alphabet for the Armenian language. He supported the translation of the Bible and the Greek and Syrian Doctors of the Church into Armenian, and translated some of holy scripture himself. Isaac served as both civil and religious ruler of his people, established a national liturgy, and was responsible for the beginnings of Armenian literature. He was driven into retirement in 428 when the Persians conquered part of his territory, but later returned as Catholicos at Ashtishat from where he worked until he death. He is considered the founder of the Armenian Church.
He died at the age of 110 at Ashtishat, of natural causes.
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