{Ernst-Friedrich Kraentzler, op. cit., p. 64, gives Gertrude's mother as Eilica Babenburg von Schweinfurt (1000-1055). "Ancestral Roots..." (Balt., 1992) 164-23 reports Gertrude as "widow of Florent I, Count of Holland, daughter of Bernard II." If Eilica Babenburg is her mother - Eilicia is dau. of Henry von Schweinfurt (d. Sept. 17, 1017) and Gerberge of Henneberg - Henry is son of Berthold von Babenberg (d. Sept. 15, 980) and Eiliswinta von Walbeck (d. Sept. 19, 1015) - Berthold is son of Arnulf the Bad and wife Judith.}

References: [ES],[RFC],[Talbot1],[AR7]