Probably Lady Jane Grey, since she only ruled for 13 days, though "least successful" is highly subjective
I think Willian and Mary were the most successful monarch
The first King of England ( or king of the English) was Offa, King of Mercia, one of several kingdoms in what is now England, from 754-796. He became King of England by conquering most of the other kingdoms. So the first English monarch was not chosen. He made himself the English monarch by successful conquest.
English rulers turned to parliament for funds. In this way, it could limit the power of the monarch.
Henry VIII
English rulers turned to parliament for funds. In this way, it could limit the power of the monarch.
The English Bill of Rights reduced the powers of the English monarch while what
english bill of rights
William IV. He was monarch of all of Great Britain, not just England.
investiture
George II
English bill of rights
George I became the first English monarch from the House of Hanover in 1714.