Question: The man who was Prince of Wales in 1399 came from what dynastic English house?
Sentence (from "Dunstable Swan Jewel"): It was excavated in 1965 on the site of Dunstable Friary, and is presumed to have been intended as a livery badge given by an important figure to his supporters; the most likely candidate is probably the future Henry V of England, who was Prince of Wales from 1399.
Relevant evidence: Yes