The Union of Lyons
The Union of Lyons was negotiated for reasons of state: Michael VIII, having recovered Constantinople from the Latins in 1261, sought through reconciliation with the papacy to forestall a renewed Western crusade against his empire. The union was rejected by a large part of the Orthodox clergy and people, who regarded it as a betrayal of the faith. Resistance was especially strong among the monastics of Mount Athos, who had no part in the emperor's political calculations and refused to commemorate the Pope or to accept the Latin additions to the faith.
The persecution that followed the union fell heavily on the Holy Mountain. The Zographou martyrs are remembered alongside other Athonite confessors of the same period, and their commemoration stands as a sign of monastic resistance to an imposed ecclesiastical union. The union itself was repudiated after Michael VIII's death in 1282.