The English Civil War, also known as the Great Rebellion or the English Revolution, was a series of armed conflicts that took place between 1642 and 1651 in England, Scotland, and Ireland. This war was fought between the supporters of the Parliamentarian cause led by Oliver Cromwell and the Royalist cause led by King Charles I. Other synonyms for the English Civil War include the Wars of the Three Kingdoms, the Commonwealth Period, and the Puritan Revolution. These names are often used interchangeably to describe the same historical event, but they carry slightly different connotations and perspectives on the complex political and religious conflicts that shaped this critical period in British history.