text: From 1506 to 1626 , it changed from the simple ground plan of a Greek crose with four arms of equal length , as favored by Bramante and his arch-enemy Michelangelo , to the final form of Maderno 's Latin croseextended by a long nave , as demanded by the popes of the Counter-Reformation .
  
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  The popes of the Counter-Reformation demanded that the design be changed .