Cyrillos Lukaris or Cyril Lucaris or Cyril Lucar (1572 – June 1638) was a Greek prelate and theologian and a native of Crete. He later became the Patriarch of Alexandria as Cyril III and Patriarch of Constantinople as Cyril I. He was the first great name in the Orthodox Church since the fall of Constantinople in 1453, and dominated its history in the 17th century.