The Council of Florence is the seventeenth ecumenical council recognized by the Catholic Church, held between 1431 and 1449. It was convoked as the Council of Basel by Pope Martin V shortly before his death in February 1431 and took place in the context of the Hussite Wars in Bohemia and the rise of the Ottoman Empire. At stake was the greater conflict between the conciliar movement and the principle of papal supremacy.
Council of Florence in the Nuremberg Chronicle
Pope Martin V convoked the Council of Basel in 1431: it became the Council of Ferrara in 1438 and the Council of Florence in 1439
Sketches by Pisanello of the Byzantine delegation at the Council
A figure in Benozzo Gozzoli's 1459 Journey of the Magi is assumed to portray John VIII Palaiologos.
Pope Martin V, born Otto Colonna, was the head of the Catholic Church and ruler of the Papal States from 11 November 1417 to his death in February 1431. His election effectively ended the Western Schism of 1378–1417. He is the last pope to date to take on the pontifical name "Martin".
Portrait of Martin V after Pisanello
Pope Martin's election as pope. Chronicle of Ulrich of Richenthal.