A Republic? Under Cromwell,between the reigns of Charles 1 and Charles 11,England was described as being a Commonwealth.
King George lll was the 18 monarch during revolution war
King George III
King george 3
Parliament took control of the country after and during the English Civil War (1642-1651).
England has not had a monarch since the act of union in1707
That was King George III.
Queen Victoria.
Queen Victoria
England was a monarchy, and still is, of course. The monarch's powers were much more extensive than they are now.
King Henry VIII, he was also the first protestant Monarch in the UK as it was during his reign that England became protestant.
There was no monarch of Scotland after Queen Anne who was on the throne during the act of union with England in 1707. In 1825 the monarch of the UK was George IV.