Marriage and children

He married Catherine Spencer, daughter of Sir Robert Spencer of Spencer Court and Lady Eleanor Beaufort. Her maternal grandparents were Edmund Beaufort, 2nd Duke of Somerset and Eleanor Beauchamp. They had five children:

Henry Percy, 6th Earl of Northumberland (1502–1537).

Sir Thomas Percy (c. 1504 – 2 June 1537. He was executed as a participant in the Pilgrimage of Grace. He was father of both Thomas Percy, 7th Earl of Northumberland and Henry Percy, 8th Earl of Northumberland. A daughter, Joan, married an Arthur Harris of Essex.+

Sir Ingelram Percy (c. 1506–1538). He was a participant in the Pilgrimage of Grace. He died imprisoned in the Tower of London. Katherine Spencer was the daughter of Sir Robert Spencer of Spencercombe, Devon (c.1430-March 13, 1492+) and Eleanor Beaufort, countess of Wiltshire (c.1431-August 16, 1501). She married Henry Percy, 5th earl of Northumberland (January 14, 1478-May 19, 1527). They were the parents of Margaret (c.1495-c.1540), Henry, 6th earl (1502-January 30, 1537), Sir Thomas (c.1504-x. June 2, 1537) Sir Ingram (or Ingelram) (1505+-1538), and Maud (d. yng). After Northumberland's death at Wressle, the earl of Cumberland was sent by Cardinal Wolsey and the king to administer his estate. A letter to Thomas Heneage, gentleman usher to Wolsey, written on July 17, 1527, indicates that, according to instructions, Cumberland had requested that Katherine and her sister take up residence in his house of Bolton, in Craven. The countess claimed to be too weak and ill to make the journey. Her preference was to remain where she was or to go to Lady Pickering, in the same county. A letter included in Mary Anne Everett Green's Letters of Royal and Illustrious Ladies, written from Katherine’s manor at Semer or Seamer (near Scarborough) on January 11, 1535, to Thomas Cromwell, asks the king’s secretary to intervene on behalf of one of her servants who is being held in jail for a crime he did not commit. According to her, his enemies had lied, claiming he’d spoken out against the king. In February 1537, Lady Northumberland herself was arrested on the charge that she'd forwarded a letter to her son Thomas from Sir Francis Bigod, one of the rebel leaders in the Pilgrimage of Grace. Her son Thomas was executed, and her son Ingram was imprisoned. She is generally believed to have taken an active role in supporting the rebels, but as was usual in these cases, noblewomen were not severely punished. Sir Ingram's will, written on June 7, 1538 and proved March 21, 1538/9, left his mother a tablet of gold and control of the £20 he left to his illegitimate daughter, Isabel, until the child was of age. Katherine's goods and properties were seized and inventoried when she was arrested, but upon her release in early October they were returned to her. From her son, the earl of Northumberland, Katherine held an annuity of £413. 6s. 8d in lieu of a jointure and it apparently continued after his death.

Margaret Percy (c. 1508–1540). She married Henry Clifford, 1st Earl of Cumberland.

Maud Percy (c. 1510–?).