I would imagine you are right with Catherine of Aragon, as she was Henry`s Queen, and as you obviously know, previously married to his brother. Can`t think of another one.
4. I don't think quiz-setters should put forward questions where the answers are ambiguous and still being argued in certain quarters of the native countries.
However, I believe tree peony is now widely accepted as the flower of China, and plum blossom now of Taiwan.