Poss. HM Juan Carlos' 13-Great Grandmother. Poss. Philippe of Belgium's 13-Great Grandmother. Poss. Grand Duke Henri's 13-Great Grandmother. Poss. HM Margrethe II's 13-Great Grandmother. Poss. HM Beatrix's 13-Great Grandmother. Poss. HM Carl XVI Gustaf's 13-Great Grandmother. Poss. `Red Baron' Richthofen's 10-Great Grandmother.