Cyril Lucaris, Greek patriarch and theologian (died 1638)

Cyril I of Constantinople (Cyril Lucaris or Kyrillos Loukaris was a Greek prelate and theologian, and a native of Heraklion, Crete. He later became the Greek Patriarch of Alexandria as Cyril III and Ecumenical Patriarch of Constantinople as Cyril I. He has been said to have attempted a reform of the Eastern Orthodox Church along Calvinist Protestant lines. Attempts to bring Calvinism into the Orthodox Church were rejected, and Cyril I's actions, motivations, and specific viewpoints remain a matter of debate among scholars. Cyril I is locally venerated as a hieromartyr in the Alexandrian Orthodox Church; the Holy Synod of the Patriarchate of Alexandria glorified Loukaris on 6 October 2009, and he is commemorated on 27 June.