Tomb of Antipope John XXIII

The marble-and-bronze tomb monument of Antipope John XXIII (Baldassare Cossa, c. 1360–1419) was created by Donatello and Michelozzo for the Florence Baptistry adjacent to the Duomo. It was commissioned by the executors of Cossa's will after his death on 22 December 1419, and completed during the 1420s, establishing it as one of the early landmarks of Renaissance Florence. According to Ferdinand Gregorovius, the tomb is "at once the sepulchre of the Great Schism in the church and the last papal tomb which is outside Rome itself". Antipope John XXIII had a complicated life, legacy, and relationship with the city of Florence. Baldassare Cossa was a Neapolitan nobleman who grew up in Bologna. Pope Boniface IX elevated Cossa to the Archdiocese of Bologna in 1396 and made him a cardinal in 1402.

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