*Instanbul or Constantinople are both Greek definitions and toponyms
(Reuters) - Patriarchs of the world's 250 million Orthodox Christians ended a rare summit in Istanbul on Sunday calling for a peaceful end to the crisis in Ukraine and denouncing violence driving Christians out of the Middle East.
Twelve heads of autonomous Orthodox churches, the second-largest family of Christian churches, also agreed to hold a summit of bishops, or ecumenical council, in 2016, which will be the first in over 1,200 years.
The Istanbul talks were called to decide on the council, which the Orthodox have been preparing on and off since the 1960s, but the Ukraine crisis overshadowed their talks at the office of spiritual leader Ecumenical Patriarch Bartholomew.