Question: What is the cause of death of Lionel Of Antwerp, 1St Duke Of Clarence's mother?
Sentence (from "Lionel of Antwerp, 1st Duke of Clarence"): Lionel of Antwerp, 1st Duke of Clarence, KG (29 November 133817 October 1368) was the third son, but the second son to survive infancy, of the English king Edward III and Philippa of Hainault.
Relevant evidence: Yes