From "The Complete Peerage" Vol III, Pub 1910:
CLIFFORD pg. 293
VII. 1391 or 1393.
7. John (de Clifford), Lord Clifford, Sheriff of Westmorland, only s. and h., scarce 3 years old at his father's death; made proof of his age (1410-11) 12 Hen. IV. He was sum. to Parl, from 21 Sep. 1411 to 26 Feb. 2420/1.(a) He took part in a great tournament at Carlisle between six English and six Scottish Knights, as also in the French war.
K.G. 3 May 1421. He m., between Aug. 1403 and Nov. 141 2, Elizabeth,
da. of the famous Sir Henry Percy ("Hotspur"), by Elizabeth, da. of Edmund (de Mortimer), Earl of March. He d. 13 Mar. 1421/2, being slain at the siege of Meaux, in France. His widow m., 2ndly (cont. 7 May 1426; lic. to m. whom she would, 20 July 1426; disp. after marr., 28 Nov. 1426), as his 1st wife, Ralph (Nevill), 2nd Earl of Westmorland, who d. 3 Nov. 1484. She d. 26 Oct. 1437.
I hope this helps.
Terry Welshans