Got pissed at Charles I for dissolving it, and lead the parliamentarians into battle against royal authority during the English civil war. Captured Charles, he escaped. Captured him again and executed him. Helped establish England's one and only republic in 1649, then said "screw it" and made a dictatorship. Killed some Irishmen. Banned Christmas presents. People got mad. I died. Whole thing fell apart. Still considered one of the greatest Britons of all time.