After the English Civil War who became the leader of England?

By the end of the cilil war England was ruled by oliver cromwell, who had been a driving force in the parlimentary cause and had helped win them many battles. Although the king retained his title, he lost all power and fled to the isle of man where he was captured, imprisoned and eventualy exicuted. cromwell ruled for a frurther 11 years until his death when he was replaced by the king's son Charles the 2nd in 1660