Senate Square, formerly known as Decembrists' Square from the 1920s to 2008, and (formally) as Peter's Square, from 1782 to 1925, is a city square in Saint Petersburg, Russia. It is situated on the left bank of the Bolshaya Neva, in front of Saint Isaac's Cathedral. In 1925 it was renamed Decembrists' Square to commemorate the Decembrist Revolt, which took place there in December 1825.