Duchy of La Vallière
From Wikipedia, the free encyclopedia
The Duchy of La Vallière (duché de La Vallière) was a noble French title created on 13 May 1667[1] by Louis XIV for his one time mistress Louise Françoise de La Baume Le Blanc. It became extinct de facto in 1780 at the death of Louise's great-nephew Louis César de La Baume Le Blanc, the famous bibliophile and military man.