title: Christina, Queen of Sweden
context: Christina (18 December 1626 – 19 April 1689), the only surviving legitimate child of King Gustav II Adolph and his wife Maria Eleonora of Brandenburg, reigned as Queen of Sweden [note 1] from 1632 until her abdication in 1654.[7] At the age of six,[8] Christina succeeded her father  upon his death at the Battle of Lützen, but began ruling the Swedish Empire when she reached the age of 18 in 1644.
question: Who was the last Queen of Sweden?
answers: Christina