 John of Lancaster – the third eldest son of Henry of Bolingbroke – resides at Kenilworth Castle with his mother Countess Mary and three brothers Harry, Thomas, and Humfrey.The boys are visited by their grandfather, John of Gaunt, and a large retinue that includes his mistress Katherine Swynford, his daughter Lady Elizabeth, and his three Beaufort sons.Mary privately worries to Katherine that the King will never forgive her husband's participation at Radcot Bridge and the loss of his "dear friend" Oxford.