Maria Antonia Archduchess of Austria, Benjamin von Block,1684. Only surviving child of the uncle/cousin/niece marriage of Leopold I of Austria, HRE and Margaret Teresa of Spain. "The Peerage" gives her a "consanguinity index" of 25.89%, just behind her mother's of 26.38%. Her father's is a lowly 14.27% (The present Prince of Wales, whose parents are distant cousins several times over is 2.09%; the Duke of Cambridge is 0%.) Married a (relatively) distant cousin Maximiliian II of Bavaria.