Constantius I of Constantinople (; 1770 â 5 January 1859) was Ecumenical Patriarch of Constantinople during the period 1830âÂÂ1834.
He was born in 1770 in Constantinople. He studied in the Patriarchal School, in IaÃÂi and in Kiev. In 1805, he was elected Archbishop of Sinai, a position he held until he was elected Ecumenical Patriarch in 1830. He resigned in 1834 and devoted his life to studying and writing. He died on 5 January 1859.