King Charles I The King, Charles Stuart, was tried for high treason on this spot by the High Court of Justice established by the Commons of England for that purpose, Saturday 20th Monday 22nd, Tuesday 23rd and Saturday 27th January 1649. The King was convicted of treason and sentenced to death on Saturday 27th January and executed in front of the Banqueting House, Whitehall Palace, at two o'clock in the afternoon of Tuesday 30th January 1649.