Raphael also died , in his early 30s , in 1520 , before any important changes could be made to the building . The next architect was Peruzzi who like some of the ideas that Raphael had , but did not like the Latin Cross plan . In 1520 Raphael also died , aged 37 , and his successor Baldassare Peruzzi maintained changes that Raphael had proposed to the internal arrangement of the three main apses , but otherwise reverted to the Greek Cross plan and other features of Bramante .