Page "Peter III of Russia" Paragraph 19

After his death, four fake Peters ( five if Šćepan Mali of Montenegro is included ) came forth, supported by revolts among the people who believed in a rumor that Peter had not died, but had secretly been imprisoned by Catherine.

The most famous was the Cossack peasant Yemelyan Pugachev.

Under this guise, he led what came to be known as Pugachev's Rebellion in 1774, ultimately crushed by Catherine's forces.