In 1455 , Donatello released what famous work of art ?
The tomb monument was the first collaboration between Donatello and Michelozzo , who went on to collaborate on the tomb of Cardinal Rainaldo Brancacci in the Church of Sant'Angelo a Nilo in Naples , the tomb of Papal Secretary Bartolomeo Aragazzi in what is now the Duomo of Montepulciano , and the external pulpit of the Duomo of Prato .