Mary, Queen of Scots (reigned 1542–1567) married Henry Stuart, Lord Darnley, the eldest son of the Earl and Countess of Lennox in July 1565. Darnley was a great-grandson of King Henry VII of England and Mary's first cousin, and he was considered to have a strong claim to the Scottish throne. On the evening before their marriage, Mary proclaimed Darnley "King of Scots", a title that she could not legally grant him without the consent of Parliament, but which was never formally challenged. However, this title did not grant him any automatic right of rule or of succession to the throne if Mary should die. For that to happen, it was necessary that Mary grant him the Crown Matrimonial of Scotland, which never happened.
Queen Victoria (reigned 1837–1901) wanted to make her husband Albert "king consort", but the British government refused to introduce a bill allowing it, as Albert was a foreigner. She instead gave him the title of Prince Consort in 1857.