Isidore of Kiev, also known as Isidore of Thessalonica (Greek: Ἰσίδωρος τοῦ Κιέβου; Russian: Исидор; Ukrainian: Ісидор; b. Peloponnesus, 1385-d.Rome, 27 April 1463) was a Greek Metropolitan of Kiev, cardinal, humanist, and theologian. He was one of the chief Eastern defenders of reunion at the time of the Council of Florence.
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