偽ドミトリー1世
After the death of Boris Godunov, Prokopy and his brother Zakhary Lyapunov sided with False Dmitriy I. In early 1606, he took part in the Bolotnikov Uprising on the side of the rebels. In November 1606, Lyapunov came to Moscow and gave himself up to Vasili IV. After his repentance, Lyapunov was made a dvoryanin of the Boyar Duma (1607). In 1608–1610, Lyapunov led the army of service class people against a peasant uprising in the Ryazan region and supporters of False Dmitriy II. In July 1610, Lyapunov was the one to organize the overthrowing of Vasili IV.