Isidore of Kiev

His Eminence Isidore of Kiev
Cardinal Latin Patriarch of Constantinople
Diocese	Constantinople
Installed	20 April 1458
Term ended	27 April 1463
Predecessor	Gregory Mammas
Successor	Basilios Bessarion
Other post(s)	Cardinal-bishop of Sabina
Orders
Consecration	1437
Created cardinal	18 December 1439
Rank	Cardinal bishop
Personal details
Born	1385 Monemvasia, Byzantine Greece, Byzantine Empire
Died	27 April 1463 (aged 77-78) Rome, Papal States
Nationality	Greek
Denomination	Eastern Catholic (formerly Eastern Orthodox)
Previous post(s)	Metropolitan of Kiev (1433–1458) Cardinal-Priest of Santi Marcellino e Pietro (1439–1451) Camerlengo of the Sacred College of Cardinals (1450) Dean of the College of Cardinals (1461–1463) Administrator of Nicosia (1458–1463)
Coat of arms

Styles of Isidore of Kiev
Reference style	His Eminence
Spoken style	Your Eminence
Informal style	Cardinal
See	Sabina e Poggio Mirteto (suburbicarain)

Isidore of Kiev^[a], also known as Isidore of Thessalonica (1385 – 27 April 1463), was a prelate of Byzantine Greek origin. From 1437 to 1441 he served as the Metropolitan of Kiev and all Rus' in the patriarchate of Constantinople of the Eastern Orthodox Church. He was a supporter of the Union of Florence which he proclaimed in Hagia Sophia on 12 December 1452.^[1][2] In the Latin Church, Isidore was the cardinal bishop of Sabina,^[3] Archbishop of Cyprus, Camerlengo of the Sacred College of Cardinals and the Latin Patriarch of Constantinople.

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