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15th–16th century Moscow–Constantinople schism

Split between the Churches of Moscow and Constantinople

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On 15 December 1448, Jonah became the metropolitan of Kiev and all Rus' within the Russian Orthodox Church without the agreement of the Ecumenical Patriarchate of Constantinople, which made the Russian Orthodox Church de facto independent. In response, in 1458, Gregory the Bulgarian was appointed and consecrated by the Pope of Rome as the Byzantine Catholic metropolitan of Kiev. Metropolitan Gregory was then recognised by Patriarch Dionysius I of Constantinople in 1466; since Constantinople maintained the Union with the Catholic Church until 1484, Kiev returned under Constantinople's jurisdiction. Dionysius therefore demanded in 1467 that all the hierarchs of the Muscovy submit to Gregory, but Moscow peremptorily refused. On the same year, Grand Prince Ivan III of Moscow declared a complete rupture of relations with the Patriarchate of Constantinople.

Relations were gradually restored and in 1560, the Patriarch of Constantinople considered the metropolitan of Moscow to be his exarch. From 1589 to 1591, the Russian Orthodox Church was recognized as autocephalous, and the patriarch of Moscow later became the eighth patriarch of the Eastern Orthodox Church.

Background

Metropolis of Kiev and all Rus'

The Metropolis of Kiev and all Rus' was a metropolis of the Eastern Orthodox Church that was erected on the territory of Kievan Rus'. It existed between 988 AD and 1596 AD. Canonically, it was under the jurisdiction of the Ecumenical Patriarchate of Constantinople. The episcopal seat (cathedra) was located in the city of Kiev.

Ecumenical council

An ecumenical council of the Catholic Church—the Council of Florence—took place from 1431 to 1449. Although he resisted at first, the Grand Prince of Moscow—Vasily II of Moscow—eventually permitted the Metropolitan of Kiev and all Rus'—Isidore of Kiev—to attend the council on condition that Isidore should return with "the rights of Divine law and the constitution of the holy Church" uninjured. The council healed the Great Schism by uniting the Roman Catholic and Eastern Orthodox churches. The union was proclaimed on 6 July 1439 in the document Laetentur Caeli which was composed by Pope Eugene IV and signed by the Holy Roman Emperor Sigismund and all but one of the bishops present. Some Greek bishops, perhaps feeling political pressure from the Byzantine Emperor, reluctantly accepted the decrees of the council. Other Eastern bishops, such as Isidore, did so with sincere conviction. Sylvester Syropoulos and other Greek writers charge Isidore with perjury because he accepted the union, despite his promise to Vasili II.

Following the signing of the bull, Isidore returned to the Grand Duchy of Moscow. In the Kremlin's Dormition Cathedral, Isidore read the decree of unification aloud. He also passed a message to Vasili II from the Holy See, containing a request to assist the metropolitan in spreading the Union in Rus'. Three days later, Isidore was arrested by the Grand Prince and imprisoned in the Chudov Monastery. He arranged for certain Rus' clergy to denounce the metropolitan for refusing to renounce the union with Rome. As a result, the Great Prince of Moscow voided the union in his lands and imprisoned Isidore for some time. Having adjudged Isidore to have apostatized to Catholicism, he was deposed by a local synod.

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