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Second Council of Lyon

14th ecumenical council of the Catholic Church (1272–74)

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In addition to Aragon, which James represented in person, representatives of the kings of Germany, England, Scotland, France, the Spains and Sicily were present, with procurators also representing the kingdoms of Norway, Sweden, Hungary, Bohemia, Poland, and the "realm of Dacia". In the procedures to be observed in the council, for the first time, the nations appeared as represented elements in an ecclesiastical council, as they had already become represented in the governing of medieval universities. That innovation marks a stepping-stone towards the acknowledgment of coherent ideas of nationhood, which were in the process of creating the European nation-states.

The main topics discussed at the council were the conquest of the Holy Land and the union of the Eastern and Western Churches. The first session took place on 7 May 1274 and was followed by five additional sessions on 18 May 1274, 4 or 7 June 1274, 6 July 1274, 16 July 1274, and 17 July 1274. By the end of the council, 31 constitutions were promulgated. In the second session, the fathers approved the decree Zelus fidei, which contained no juridical statutes but rather summed up constitutions about the perils of the Holy Land, the means for paying for a proposed crusade, the excommunication of pirates and corsairs and those who protected them or traded with them, a declaration of peace among Christians, a grant of an indulgence for those willing to go on crusade, restoration of communion with the Greeks, and the definition of the order and procedure to be observed in the council. The Greeks conceded on the issue of the Filioque (two words added to the Nicene Creed), and union was proclaimed, but the union was later repudiated by Andronicus II, heir to Michael VIII. The council also recognised Rudolf I as King of the Romans and ended the interregnum.

Union of churches

Wishing to end the Great Schism that divided the Catholic Church and Eastern Orthodox Church, Pope Gregory X sent an embassy to Michael VIII, who had reconquered Constantinople, and put an end to the remnants of the Latin Empire in the East. Gregory asked Latin despots in the East to curb their ambitions. Eastern dignitaries arrived at Lyon on 24 June 1274 and presented a letter from the Emperor. On 29 June 1274 (the Feast of Peter and Paul, patronal feast of the popes), Gregory celebrated Mass in St John's Church, where both sides took part.

The Greeks read the Nicene Creed, with the Western addition of the Filioque clause sung three times. The council was seemingly a success but did not provide a lasting solution to the schism. The Emperor was anxious to heal the schism, but the Eastern clergy opposed the decisions of the council. Patriarch Joseph of Constantinople abdicated and was replaced by John Bekkos, a convert to the cause of union. In spite of a sustained campaign by Bekkos to defend the union intellectually and vigorous and brutal repression of opponents by Michael, the vast majority of Byzantine Christians remained implacably opposed to union with the Latin "heretics".

Pope Martin IV's excommunication of Michael without provocation on 10 April 1281, at the insistence of Charles of Anjou, put an end to the union of Lyons. Michael died on 11 December 1282 and his son and successor, Andronikos II, repudiated the union in the Council of Blachernae. Bekkos was forced to abdicate and was put under house arrest, until his death in 1297.

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