The known siblings of Gertrude include (1) Gebhard III, Count of Sulzbach, (2) Adelheid, Abbess of Niedernburg at Passau, (3) Bertha of Sulzbach, Byzantine Empress, (4) Luitgarde, wife first of Godfrey II of Leuven and secondly of Hugo XII, Count of Dagsburg and Metz, and (5) Matilda of Sulzbach, wife of Engelbert III of Istria.
Gertrude Stein | Gertrude Dunn | Gertrude Lawrence | Sulzbach | Gertrude Berg | Sulzbach-Rosenberg | Saint Gertrude | Gertrude | Gertrude Jekyll | Gertrude Bell | Gertrude Atherton | Gertrude (Hamlet) | Sulzbach, Saarland | Herren-Sulzbach | Gertrude B. Elion | Matilda of Sulzbach | Gertrude Tuckwell | Gertrude the Great | Gertrude of Nivelles | Gertrude of Flanders, Duchess of Lorraine | Gertrude of Brunswick | Gertrude Kleinová | Gertrude Himmelfarb | Amberg-Sulzbach | St. Gertrude Roman Catholic Church | Kastl, Amberg-Sulzbach | Gertrude Warner | Gertrude Vanderbilt Whitney | Gertrude Simmons Burlingham | Gertrude Sanford Legendre |