Formulate an answer to this elaborate question: Who was the wife of the king of the Scots who was assassinated on 21 February 1437?
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Answer: Mary of Guelders

Formulate an answer to this elaborate question: Which Racehorse was the daughter of the American Thoroughbred was the unofficial 1920 American Horse of the Year, considered one of the greatest racehorses of all time?
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Answer: Bateau

Formulate an answer to this elaborate question: Windsor Great Cave is on the land owned by the non-governmental organization founded in which year?
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Answer:
1961