Henry Percy's father and grandfather were killed in rebellions against what King of England who was also the Lord of Ireland from 1399-1413?
Henry IV of England: Henry IV (15 April 1367 – 20 March 1413), also known as Henry of Bolingbroke ( ), was King of England and Lord of Ireland from 1399 to 1413, and asserted the claim of his grandfather, Edward III, to the Kingdom of France.
i don't know