In Imperial Russia, the Trubetskoy Bastion prison, located within the Peter and Paul Fortress, housed political prisoners and later, prominent revolutionaries (provided, of course, they managed to survive on bread and water and were not executed before 1917). Lenin's older brother Alexander, Leon Trotsky and Prince Kropotkin are counted among the most famous inmates. After the revolution, the prison continued to be packed – this time, with the tsar's supporters.