 Complete the following phrase:  The Eastern Church continued to decline with the Eastern Roman Byzantine Empire, undercutting Constantinoples claim to equality with Rome. Twice an Eastern Emperor tried to force the Eastern Church to reunify with the West. First in the Second Council of Lyon 12721274 and secondly in the Council of Florence 14311449. Papal claims of superiority were a sticking point in reunification, which failed in any event. In the 15th century, the Ottoman Empire captured 