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The second Council of Lyon, convened in 1274 by Pope Gregory X, aimed to reunite the Orthodox and Roman Catholic Churches. Byzantine Emperor Michael VIII Palaeologus agreed to papal supremacy, hoping for financial aid for his wars. A profession of faith was approved, and reunion was accepted, but the Greek clergy later rejected it.1

The council also established regulations for papal elections and placed restrictions on certain religious orders. It is considered the 13th ecumenical council of the Roman Catholic Church.1

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