Patriarch Bartholomew I, born Dimitrios Archontonis in 1940, is the 270th Ecumenical Patriarch of the Eastern Orthodox Church. He has held this position since 1991 and is often referred to as the "Green Patriarch" due to his environmental advocacy. He is based in Istanbul, Turkey, at the Ecumenical Patriarchate. As a prominent religious leader, Bartholomew I plays a crucial role in promoting dialogue among different Christian denominations and other faiths. He has worked to strengthen the unity of the Orthodox Church and has been involved in various global issues, including climate change and interfaith relations.