Council of Ferrara-Florence - Britannica
https://www.britannica.com/event/Council-of-Ferrara-Florence
WebOn Jan. 10, 1439, the council was moved from Ferrara to Florence when a plague hit Ferrara. After much discussion, the Greeks agreed to accept the Filioque and also the Latin statements on purgatory, the Eucharist, and papal primacy. The decree of union between the two groups ( Laetentur Caeli) was signed on July 6, 1439.
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