Question: Who is the maternal grandmother of Valentine De Riquet De Caraman-Chimay?
Sentence (from "Marie-Clotilde-Elisabeth Louise de Riquet, comtesse de Mercy-Argenteau"): On 11 April 1860 she married Eugène Arnould Henri Charles François Marie, comte de Mercy-Argenteau (22 August 1838 – 2 May 1888).
Relevant evidence: No