Katherine Parr was lucky to escape her marriage to Henry VIII alive. A devoted Protestant (which wasn't cool in Henry's eyes), Katherine was a clever woman who greatly influenced her step-daughter, the future Queen Elizabeth I (when her husband wasn't flirting with Elizabeth, that is.)
I guess Henry really liked marrying women named Katherine. Poor Katherine Howard. She was not the brightest crayon in the box and not the best Queen,, but what else do you expect when a 50-year-old man marries a teenager?