What unfortunate British royal and queen consort of France was beheaded for treason due to her alleged role in plotting to overthrow Queen Elizabeth I?

Mary, Queen of Scots, spent most of her life in France and was married to the Dauphin of France, making her the queen consort. After his death, she returned to Scotland and her presence threatened Elizabeth I's claim to the throne. Mary was confined for nearly two decades before she was beheaded for conspiring to overthrow her cousin.

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