I do not want to sound trite but The Bible says Christ is the head of the church. So the simple answer is Jesus.
St. Peter was appointed as the first leader (pope) of the Church by Our Lord.
Who was an early leader of the Ethiopian Orthodox Church
Peter I think
Princess Olga of Kiev was the first Russian leader to convert to Christianity. She was baptized in Constantinople into the Orthodox Church and is considered an equal to the Apostles.
Gregory the Great
Christ chose the Apostle Simon, who he renamed Peter, as the first leader of His church.
Peter was chosen by Christ to be the first leader of his new Church - the first pope.
The leader of the Church of Christ is called Reverend and President of the Church.
Jesus Christ is the invisible leader of the Church.
God is the leader of worship ina church
The Protestant Church has no one leader. Each denomination within the Protestant Church has it's own leader.
the leader of the Byzantine Church was called the Metropolitans.