The event that marked the end of feudalism in England was the English Civil War, which took place between 1642 and 1651. This conflict arose from tensions between King Charles I and Parliament over governance, taxation, and authority. The war led to a series of battles, ultimately resulting in the defeat of the royalists and the execution of Charles I in 1649. Following the war, Oliver Cromwell established the Commonwealth, further diminishing the power of the monarchy and feudal obligations. Although monarchic power was later restored, the civil war fundamentally altered the structure of English society and governance, contributing to the decline of feudalism.