St Cyril of Jerusalem - March 18th
Born: c. AD 313 at Caeserea Maritima, Israel
Died: AD 386 at Jerusalem, Israel
Canonized: AD 1737
Claim to Fame: Doctor, Church Father, and Bishop; Ostensibly a deacon, ordained to priesthood by Bishop Maximus of Jerusalem; Ran afoul of emperors Constantius and Valens, and was deposed by them/re-instated twice by their successors;  First Council of Constantinople finally settled in his favor;  Taught that sin is a consequence of freedom, not a natural conditon, and God's depth of forgiveness, which was rarely preached; His Catechetical Lectures are an early theological treasure 

St. Cyril of Jerusalem - c. 350 A.D. Catechetical Letters