Question: The County of Savoy and the Plantaganet monarchy of England had been linked by the marriage of which person, also known as Henry of Winchester, was King of England, Lord of Ireland and Duke of Aquitaine from 1216 until his death, and Eleanor of Provence in 1236? 
Sentence (from "Eleanor, Fair Maid of Brittany"): Thus she posed a potential threat to John, and following his death in 1216, equally to her cousin, Henry III of England.
Relevant evidence: No