Gregory refused, but after consulting a committee of theologians who declared him to be a heretic, the council promoted by Cardinal Cossa and other independent prelates met at Pisa.
Alexander having died in May before entering the Eternal City, Cardinal Cossa was elected as John XXIII.; Florence without offending him made peace with Ladislas, who had ceased to be dangerous, and purchased Cortona of the pope.
That the council was merely a tool in the hands of the ambitious and adroit Baldassare Cossa, was a fact unsuspected by its members who were animated by a fiery enthusiasm for the re-establishment of ecclesiastical unity; nor did they pause to reflect that an action against both popes could not possibly be lawful.
The cardinals at once elected his successor - Baldassare Cossa, who took the name of John XXIII.
De Molinari, Malthus, essai sur le Principe de population (Paris, 1889); Cossa, Il Principio di popolazione di T.
After staying for long periods at Mantua and Florence, where the deposed pope, Baldassare Cossa (John XXIII.), came and made submission to him, Martin V.
This did not require prominence until the latter half of the 15th century, when its best masters were Cosimo Tura (1432-1495), Francesco Cossa (d.
Cossa in the Proceedings of the Accademia dei Lincei (1884-1885).