John VI of Vendme who married Jeanne de Ponthieu, a French noblewoman whose elder sister was Jean V de Harcourt, died in 1365.
John VI de Vendome (died 1365), Count of Vendome and Castres (13541365) was a member of the House of Montoire and was the son of Bouchard VI (12901354) and Alix de Bretagne (12971377). In 1342, he married Jeanne de Ponthieu, they had two children: Jeanne de Ponthieu, dame d'Epernon, Countess of Vendome and of Castres (Jeanne de Ponthieu, dame d'Epernon, comtesse de Vendome et de Castres, before 1336  30 May 1376) was a French noblewoman, the youngest daughter of Jean II de Ponthieu, Count of Aumale. She had an elder sister Blanche de Ponthieu (before 1326  12 April/May 1387) who became suo jure Countess of Aumale on 16 January 1340 upon the death of their father. Blanche was the wife of Jean V de Harcourt, Count of Harcourt, by whom she had issue. 
