DNB in VIAF 13 Sep. 2012 (Isidorus Kiovensis 1380-1463)
LC database 13 Sep. 2012 hdg. (Isidorus, Cardinal, d. 1463)
Scritti d'Isidoro il cardinale ruteno, 1926.
Sermones inter Concilium Florentinum conscripti, 1971 t.p. (Isidorus Arch. Kiovensis et totius Russiae)
Wikipedia 13 Sep. 2012 (Isidore of Kiev, also known as Isidore of Thessalonica; 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) http://en.wikipedia.org/wiki/Isidore_of_Kiev