Athenagoras I (Spyrou) of Constantinople
His meeting with Pope John XXIII and Paul VI (1964) in the Second Vatican Council led to rescinding the 1054 excommunications of the Great Schism. This was a significant step towards restoring full communion between Rome and Constantinople, and it produced the Catholic-Orthodox Joint declaration of 1965, which was read out on 7 December 1965 simultaneously at a public meeting of the Second Vatican Council in Rome and at a special ceremony in Istanbul. The declaration did not end the 1054 schism, but showed a desire for greater reconciliation between the two churches, represented by Pope Paul VI and Ecumenical Patriarch Athenagoras I.
Athenagoras I was born in 1886 in Tsaraplana, Epirus, Greece, and died in Istanbul, Turkey in 1972.