Seven-time Ecumenical Patriarch of Constantinople (1572–1638)
Source (Wikipedia): Cyril Lucaris

Cyril Lucaris or Kyrillos Loukaris was a Greek prelate and theologian, and a native of Candia, 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’s actions, motivations, and specific viewpoints remain a matter of debate among scholars. Cyril 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 his memory is commemorated on 27 June.