John VI of Harcourt
John VI of Harcourt (or John of Vaudémont) (1 December 1342 – 28 February 1389) was a count of Harcourt. He was son of John V of Harcourt and Blanche of Ponthieu who was the sister of Jeanne of Ponthieu.
He succeeded to his father's counties of Aumale and Harcourt and barony of Elbeuf on his execution in 1356
In 1359 John married Catherine (1342–1427), daughter of Peter I, Duke of Bourbon. They had the following children:
...
Wikipedia