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The last was King Charles I, who was tried and executed in 1649 for high treason and tyranny.—Janet Loehrke, USA Today, 19 Feb. 2026 Charles was arrested, tried, convicted of high treason and beheaded in 1649.—Danica Kirka, Los Angeles Times, 19 Feb. 2026 The display is typically only removed in cases of high treason or rebellions against the Crown, according to The Sun.—Charlotte Phillipp, PEOPLE, 23 Oct. 2025 France abolished the monarchy and declared a republic in 1792 during the French Revolution, and soon after, executed King Louis XVI by guillotine on charges of high treason.—John Toher, MSNBC Newsweek, 16 Oct. 2025 See All Example Sentences for high treason