Charles I was the King of England, Scotland and Ireland. He took the office on 27 March 1625 and was executed on 30 January 1649. Throughout his tenure he remained in a fight for power with the parliament of England since he was an advocate of the Divine rights of Kings.
He was involved in numerous things that causes public, religious and parliamentary objections about alliance with controversial religious figures, levying of taxes, marrying with a Catholic princess, religious reforms causing Bishop's wars.
He was tried and executed because the Puritans became too hostile to his religious policies. A civil war erupted and caused his defeat. He also then provoked a second world war. He was defeated and captured and was tried and executed for high treason.