In which year was Charles I executed?
1649.
Charles I was executed in 1649, after Parliament's side won the Civil War. This was a huge moment. A reigning king put on trial and killed by his own country, which had never happened in England before. It's the low point of the Stuart story, right before Cromwell takes charge without a crown.
Why it matters: This is the dramatic hinge that connects the Civil War to Cromwell's Commonwealth, so it explains why the next fact even exists.
Memory hook: Sixteen forty-nine: no more king, no throne, no shrine.
Official handbook: Chapter 3, section 3.6, page 37