Conversation so far:
can a king and queen rule at the same time
There has only been one case where a King and a Queen Regnant were crowned together. That was Queen Mary II and King William III.
when did queen mary ii reign
Mary II was Queen of England, Scotland, and Ireland, co-reigning with her husband, King William III & II, from 1689 until her death.

Question: when did the queen die
Self-contained rewrite: when did queen mary ii die