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 Percy, 2nd Earl of Northumberland Henry Percy, 2nd Earl of Northumberland (3 February 1393 – 22 May 1455) was an English nobleman and military commander in the lead up to the Wars of the Roses. He was the son of Henry "Hotspur" Percy, and the grandson of Henry Percy, 1st Earl of Northumberland. His father and grandfather were killed in different rebellions against Henry IV in 1403 and 1408 respectively, and the young Henry spent his minority in exile in Scotland. Only after the death of Henry IV in 1413 was he reconciled with the Crown, and in 1416 he was created Earl of Northumberland.
John de la Pole, 2nd Duke of Suffolk John de la Pole, 2nd Duke of Suffolk, KG (27 September 1442 – 14~21 May 1492), was a major magnate in 15th century England. He was the son of William de la Pole, 1st Duke of Suffolk, and Alice Chaucer, the daughter of Thomas Chaucer (thus making John a great-grandson of the poet Geoffrey Chaucer). His youth was blighted, in 1450, by the political fall and subsequent murder of his father, who had been a favourite of the king, Henry VI, but was increasingly distrusted by the rest of the nobility. Although the first duke of Suffolk had made himself rich through trade and- particularly- royal grants, this source of income dried up on his death, so John de la Pole was among the poorest of English dukes on his accession to the title. This was a circumstance which John felt acutely; on more than one occasion, he refused to come to London due to his impoverishment being such that he could not afford the costs of maintaining a retinue.