When King Charles I raised his royal standard at Nottingham on 22 August 1642, few of those watching could have imagined that the conflict beginning that day would end with their king's head on a scaffold outside his own palace. The English Civil War was not simply a military conflict between Royalist Cavaliers and Parliamentarian Roundheads — it was a struggle over the fundamental question of where sovereign power resided: in the monarch who claimed to rule by divine right, or in the Parliament that claimed to represent the people of England.
The roots of the conflict reached deep into the previous decades. Charles I had ruled without Parliament for eleven years — the "Personal Rule" of 1629 to 1640 — governing through royal prerogative alone and raising revenues through mechanisms that many considered illegal. His attempt to impose a new prayer book on the strongly Presbyterian Church of Scotland provoked a Scottish rebellion that forced him to call Parliament again to raise the funds for war. The Parliament that assembled in 1640 had accumulated enough grievances to make itself formidable, and it refused to be dismissed without extracting concessions. The impasse between king and parliament had become irreconcilable.
The war itself divided England in ways that crossed class and regional lines more complexly than later mythology suggested. While the North and West were broadly Royalist and London and the South East broadly Parliamentary, every county had both supporters and opponents of the King. Families were divided. Communities were split. The first major engagement at Edgehill in October 1642 was inconclusive; it set the pattern for a war that would grind on for years before Parliament's New Model Army — a professional force built on merit rather than aristocratic privilege, commanded by Sir Thomas Fairfax with Oliver Cromwell as his cavalry commander — won the decisive victories at Marston Moor and Naseby.
Charles I was captured in 1646 but refused to make the concessions Parliament demanded. He secretly negotiated with the Scots, offering them a Presbyterian settlement in exchange for military intervention. The resulting Second Civil War ended with a further Parliamentary victory, but it convinced the army's most radical officers that the King was fundamentally untrustworthy and that peace would never be possible while he lived. A purge of moderate MPs from Parliament — Pride's Purge of December 1648 — left a rump willing to proceed with what the army demanded.
The trial of Charles I was constitutionally revolutionary. No English monarch had ever been subjected to judicial proceedings at the instigation of Parliament. Charles refused to recognise the court's legitimacy, and his composed dignity through the trial gave him a dignity in defeat that he had rarely achieved in power. He was condemned for making war on his own people and sentenced to death. On 30 January 1649, outside the Banqueting House in Whitehall — the ceiling of which was painted with a glorification of divine royal authority by Rubens — Charles stepped through a window onto the scaffold and was beheaded.
The regicide shocked European opinion and created a royalist martyr. But it also cleared the path for the most radical experiment in English governance ever attempted. The Commonwealth and then the Protectorate, ruled by Oliver Cromwell, gave England twelve years without a king — an experiment that ultimately failed when Cromwell died in 1658 and his son could not sustain the regime. Charles II was invited to return in 1660. Yet the Restoration did not restore the old order entirely. The principle that Parliament was a permanent and necessary part of English governance had been established by force and could not be entirely undone. When James II attempted to rule in the old absolute way, Parliament invited William of Orange to replace him in the Glorious Revolution of 1688, and the constitutional settlement of 1689 confirmed once and for all that kings ruled in partnership with Parliament, not above it.
