This king was killed after a war that began after his Eleven Year's Tyranny and included the defeat of his supporters at Marston Moor.
This person's death was celebrated with an annual dinner by the Calves' Head Club. Richard Brandon, or "Young Gregory," refused to kill this man, who was the alleged author of the spurious autobiography Eikon Basilike. For his role in this man's death, Henry Ireton's corpse was dug up and beheaded. This man wore two shirts to avoid appearing to shiver during an event which was allowed by the Rump Parliament after Pride's Purge. This king was killed after a war that began after his Eleven Year's Tyranny and included the defeat of his supporters at Marston Moor. For 10 points, name this monarch who was executed after the English Civil War.
This person's death was celebrated with an annual dinner by the Calves' Head Club.
Charles I [prompt on "Charles"]