John VI of Vendme who married Jeanne de Ponthieu, a French noblewoman whose elder sister was Blanche de Ponthieu, died in 1365.
Jeanne de Ponthieu 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. 1365 
