Henry PERCY 1st Earl of Northumberland

  General Notes:

https://en.wikipedia.org/wiki/Henry_Percy,_1st_Earl_of_Northumberland
Henry Percy, 1st Earl of Northumberland, 4th Baron Percy, titular King of Mann, KG, Lord Marshal (10 November 1341 – 20 February 1408) was the son of Henry de Percy, 3rd Baron Percy, and a descendent of Henry III of England. His mother was Mary of Lancaster, daughter of Henry, 3rd Earl of Lancaster, son of Edmund, Earl of Leicester and Lancaster, who was the son of Henry III.

  Death Notes:

https://en.wikipedia.org/wiki/Battle_of_Bramham_Moor

Henry married Margaret NEVILLE, daughter of Ralph DE NEVILLE 2d Lord Neville of Raby and Alice DE AUDLEY. (Margaret NEVILLE was born on 12 Feb 1339 and died on 12 May 1372.)