Frédéric Maurice Casimir de La Tour d'Auvergne
Frédéric Maurice Casimir de La Tour d'Auvergne styled Prince of Turenne, was the eldest surviving son of Emmanuel Théodose de La Tour d'Auvergne. He died aged 20. He was the short-lived son-in-law of James Louis Sobieski. Wikipedia
Born: October 22, 1702
Died: October 1, 1723 (age 20 years)
Spouse: Maria Karolina Sobieska (m. 1723–1723)