Traditionally, his features have been read as those of Joseph, Patriarch of Constantinople, who died in Florence during the Council; but they could also be those of Sigismund, Holy Roman Emperor, who helped end the Great Schism by convoking the Council of Constance in 1414.
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The Union was ratified at the Council of Florence in 1439 which John attended with 700 followers including Patriarch Joseph II of Constantinople and George Gemistos Plethon, a Neoplatonist philosopher influential among the academics of Italy.