In history as we know it, Catherine Howard was Queen of England from 1540 until 1541. She was Henry Tudor's fifth wife that he named his "rose without a thorn". Catherine and Henry were married on 28 July 1540, at Oatlands Palace almost before the ink was dry on Henry's divorce papers from Anne of Cleves.
Sadly, Catherine was a young, flighty and not very wise young woman who was in love with men other than Henry. She was beheaded after less than two years of marriage on the grounds of treason for committing adultery while married to the King.
But in the novel The Most Happy Catherine's fate will be more than a bit different
The Most Happy