Question

Which claimant to the Kingdoms of England and Ireland was de facto monarch of England after the death of Edward VI for just over a week in July 1553, and was executed in 1554?

Answer 1

Lady Jane Grey
Lady Jane Grey, also known as Lady Jane Dudley and as "the Nine Days' Queen", was an English noblewoman and de facto Queen of England and Ireland from 10 July until 19 July 1553. Jane was the great-granddaughter of Henry VII through his younger daughter Mary, and was a first cousin once removed of Edward VI.