Original: Edmund of Langley , 1st Duke of York ( 5 June 1341 1 August 1402 ) was a younger son of King Edward III of England and Philippa of Hainault , the fourth of the five sons of the Royal couple who lived to adulthood .
Simplified: Edmund of Langley , 1st Duke of York ( 5 June 1341 -- 1 August 1402 ) was a younger son of King Edward III of England and Philippa of Hainault .