The first three are considered the chief ones; Clement, Ignatius and Polycarp. Isaac of Nineveh was a 7th-century Syriac bishop and theologian best remembered for his written work. Autocephalous jurisdictions. Main article: Cappadocian Fathers. The name Papias was very common in the region, suggesting that he was probably a native of the area. Evidence of Greek philosophical concepts in the writings of Ephrem the Syrian. List of independent Eastern Orthodox denominations. The Church Fathers , Early Church Fathers , Christian Fathers , or Fathers of the Church were ancient and influential Christian theologians and writers who established the intellectual and doctrinal foundations of Christianity.