The trial of Charles I took place in January 1649, marking the first time a reigning monarch was tried and executed by his own subjects. Following years of conflict during the English Civil War, which pitted the Royalists loyal to Charles I against the Parliamentarians seeking to limit his powers, the king was captured by Parliamentary forces in 1646.
In November 1648, after a series of failed negotiations and increasing tensions, the Rump Parliament established the High Court of Justice to try Charles for treason. The court was presided over by John Bradshaw, and the proceedings were marked by controversy and legal disputes, as many questioned the legitimacy of trying a king.