[RobbyS]

Cromwell. Which is why the English have a statute of him outside the houses of Parliament—to remind them.

[expat2]

No, Cromwell was even less of a military ruler than was George Washington -- he was merely a politician until the English Civil War had already begun, while George W was already a soldier in the British Army in the Colonies before the Secession of 1776.
George was set up as ruler (the new post of President in lieu of the English king) in 1788 by the elites in the Colonies while Cromwell was set up as ruler (the new post of Lord Protector in lieu of the English king) in 1653 by the elites in England at that time.
However, it is true that Cromwell was a more forceful and brutal ruler during his 5 years, and will always be remembered with disgust by the Irish, and Catholics all over the British Isles.