Gertrude of Saxony (c. 1030 – August 4, 1113), also known as Gertrude Billung, was the daughter of Bernard II, Duke of Saxony and Eilika of Schweinfurt. She married Floris I, Count of Holland (c. 1017 – June 28, 1061) c. 1050, and upon his death, her son Dirk V became Count of Holland. Since he was still young, she became regent.
When Dirk V came into power, William I, Bishop of Utrecht, took advantage of the situation, occupying territory that he had claimed in Holland. Gertrude and her son withdrew to the islands of Frisia (Zeeland), leaving William to occupy the disputed lands.
In 1063 Gertrude married Robert of Flanders (Robert the Frisian), the second son of Baldwin V of Flanders. This act gave Dirk the Imperial Flanders as an appanage - including the islands of Frisia west of the Frisian Scheldt. She and her husband then acted as co-regents for the young count.

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Children
Countess Bertha of Holland
Count Dirk V of Holland

Children
Countess Bertha of Holland
Count Dirk V of Holland