1D - Regicide: the basis for regicide and the King’s response
The execution of Charles I required a new argument about political authority as well as an army capable of enforcing it. This lesson explains why a minority turned to regicide, how the king challenged the court and why his death failed to create an agreed political order.
From negotiation to regicide
Regicide means the killing of a monarch. Executing a king after a public trial was an extraordinary step in a society that associated hereditary monarchy with lawful order and, for many, divine appointment. The parliamentary side had begun the war in 1642 claiming to defend law and religion against the king's harmful advisers and policies. Many of its supporters still wanted Charles restored under restrictions after his first defeat.
The Second Civil War changed the judgement of influential army officers. Charles's alliance with Scottish Engagers and his encouragement of a renewed challenge in 1648 made it difficult to treat him as a reliable partner in peace. The army leadership's November Remonstrance, associated with Ireton, demanded that the king be brought to justice for the bloodshed. The argument connected practical security with moral responsibility: someone who repeatedly used war to recover power should answer for its consequences.
Religious conviction strengthened this reasoning. Victories could be read as Providence, God's direction of events, and responsibility for bloodshed as a sin that demanded punishment. Such conviction did not automatically produce regicide: many equally religious people opposed the execution. It mattered when officers interpreted repeated victory and renewed war as evidence of a specific duty to act against Charles.
Regicide was thus a radical solution to an unresolved settlement crisis, promoted by a determined group with military power. It was not the settled wish of everyone who had fought for Parliament, nor the inevitable outcome of Protestant reform. The continuing willingness of many MPs to negotiate at Newport in late 1648 is evidence that another course still had important support.
The purge and a new claim to authority
The army had to overcome political and legal resistance before a king could be tried. On 6 December 1648, Colonel Thomas Pride and his soldiers excluded or arrested MPs regarded as hostile to the army's intentions. Others withdrew. The remaining Commons became known as the Rump. This was a military intervention in Parliament, rather than a free decision of the complete representative body elected in 1640.
The House of Lords rejected the proposal to establish a court to try Charles. The Rump proceeded without its consent and without the king's assent, departing from the normal idea that statute rested on King, Lords and Commons together. On 4 January 1649 the Commons declared that the people were the source of legitimate power, that the Commons represented them and that Commons decisions could have legal force without king or Lords. On 6 January it established a High Court of Justice.
These claims supplied the basis for the prosecution. Kingship was presented as a trust held for the community, rather than a position that placed its holder beyond accountability. Charles could therefore be accused of treason against the people by waging war on them. This reworked a concept of treason normally associated with offences against the sovereign.
The weakness lay in representation. The Rump invoked the people while operating after soldiers had removed many representatives and without asking the population directly to authorise the trial. Its supporters could argue that necessity and public safety justified action; opponents could answer that the court was manufactured by a coercive minority. Both the new principle of accountability and the compromised process matter when assessing the constitutional significance.
Popular sovereignty
The principle that legitimate political authority originates in the people. A government may claim this principle without giving everyone an equal vote or securing everyone's consent.
The trial and the king's response
Charles's trial began in Westminster Hall on 20 January 1649, with John Bradshaw presiding. The charge accused the king of using entrusted power tyrannically and making war against Parliament and the people. The court's case treated his part in the wars as an abuse of office for which he could be judged.
Charles refused to plead. He repeatedly asked what lawful authority had brought him before the court. To plead guilty or not guilty would imply recognition of its jurisdiction, so his response was a deliberate constitutional strategy. He argued from the established legal order: a court created without king and Lords, after a purge of the Commons, could not lawfully judge the monarch.
His claim was broader than simply asserting that he could do whatever he liked. Charles presented himself as defending the liberties of subjects against arbitrary power. If force could construct a court to condemn a king, he argued, it could place anyone's rights at risk. That argument appealed to people who disliked his policies but also feared an army deciding the constitution. His continued belief in hereditary and divine authority remained part of his position, but the legality argument was politically important in its own right.
The court rejected his challenge. Evidence was heard, and he was sentenced to death on 27 January. Some appointed commissioners refused to take part; Fairfax did not participate in condemning him. Their absence underlines that even military or parliamentary service did not entail support for regicide. Charles's refusal to recognise the court did not prevent sentence because those directing the process claimed that their authority did not depend on his consent.
Execution and the royalist response
Charles was executed outside the Banqueting House at Whitehall on 30 January 1649. His composed conduct allowed supporters to present him as a principled sufferer rather than a defeated criminal. In his final speech he associated subjects' freedom with government under law, while denying that liberty required ordinary people to share directly in government. He therefore defended a hierarchical political order as compatible with the rights of subjects.
The royalist response turned death into an argument against the new regime. Eikon Basilike, published soon after the execution, presented itself as Charles's spiritual reflections and portrayed a pious king suffering for his people. Its authorship is disputed: it should not be treated uncritically as the king's personal diary. Its significance lies in the powerful royal martyr image it circulated. Republicans answered that the image concealed responsibility for war; Milton's Eikonoklastes in 1649 was one such reply.
The disagreement demonstrates how one event could support different interpretations. For the prosecutors, execution showed that a ruler was accountable for abusing a trust. For royalists, the same proceedings showed that soldiers and a purged assembly had destroyed lawful monarchy. Charles's political defeat did not remove monarchy's emotional and religious appeal.
Nor did all three kingdoms accept the act. Scottish Covenanters had defended a king constrained by covenant, rather than consented to his execution by an English court. Scotland recognised his son as Charles II, subject to religious conditions. Royalist and Catholic interests in Ireland also continued to resist. Regicide ended Charles I's life, but did not extinguish dynastic claims or the need for military consolidation.
Constitutional change and its limits
The Rump abolished monarchy and the House of Lords in March 1649 and declared a Commonwealth and Free State in May. These were separate developments following the execution: killing Charles did not itself settle every institution of the replacement government. The old combined authority of King, Lords and Commons had been dismantled.
By institutional criteria, the change from James I's hereditary monarchy in 1603 was profound. A reigning king had been tried and executed, and government claimed legitimacy through the people and their representatives. The idea that royal authority was a trust rather than unconditional personal possession acquired a striking practical expression.
By the criterion of how widely power was shared, the result was more limited. The Rump was unrepresentative, the army could coerce civilian institutions, and most people still lacked access to formal decision-making. Property and social hierarchy survived. Regicide could be revolutionary without establishing democracy or a society of equal resources.
Immediate security and long-term legitimacy also differed. Removing Charles prevented him from negotiating another coalition, but created a royal martyr and left a living heir. Scotland and Ireland could not be controlled by a declaration in Westminster alone. The republic therefore inherited war, financial demands and contested authority. An explanation focused on the king's execution must distinguish the destruction of one ruler from the successful construction of an accepted government.
Regicide asserted a new principle of accountability through a process enforced by a narrow military and parliamentary coalition. Its constitutional radicalism coexisted with restricted participation and continued resistance.