Gertrude of Saxony
Born	c. 1030
Died	(1113-08-04)4 August 1113
Noble family	Billung
Spouse(s)	Floris I, Count of Holland Robert I, Count of Flanders
Issue	Albert Dirk V, Count of Holland Peter Bertha of Holland Floris Matilda Adela Robert II, Count of Flanders Robert II, Count of Flanders Gertrude of Flanders, Duchess of Lorraine Philip of Loo Ogiva
Father	Bernard II, Duke of Saxony
Mother	Eilika of Schweinfurt

Gertrude of Saxony (c. 1030 – August 4, 1113), also known as Gertrude Billung, was a countess of Holland by marriage to Floris I, Count of Holland, and countess of Flanders by marriage to Robert I, Count of Flanders. She was regent of Holland in 1061-1067 during the minority of her son Dirk V, and regent of Flanders during the absence of her spouse in 1086–1093.

Biography

She was the daughter of Bernard II, Duke of Saxony^[1] and Eilika of Schweinfurt.

Countess of Holland

In c. 1050, she married Floris I, Count of Holland (c. 1017 – June 28, 1061).^[2] Upon the death of her spouse in 1061, her son Dirk V became Count of Holland.^[2] Since he was a minor, 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.

Countess of Flanders

In 1063 Gertrude married Robert of Flanders (Robert the Frisian),^[3] 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 of Holland for her son during his minority.

When her spouse left for a journey to Jerusalem in 1086–1093, Gertrude served as regent of Flanders during his absence.

Family and children

She had a total of seven children with Floris I, Count of Holland:

1. Albert (b. c. 1051), a canon in Liège
2. Dirk V (c. 1052, Vlaardingen – 17 June 1091)
3. Peter (b. c. 1053), a canon in Liége
4. Bertha (c. 1055 – 15 October 1094, Montreuil-sur-Mer), who married Philip I of France in 1072.^[2]
5. Floris (b. c. 1055), a canon in Liége.
6. Matilda (b. c. 1057), who married Adalbert von Saffenburg von Klosterath.
7. Adela (b. c. 1061), who married Baudouin I, Count of Guînes.

From her second marriage to Robert of Flanders she had five children:

1. Robert II of Flanders (c. 1065 – October 5, 1111).^[3]
2. Adela (d. 1115), who first married king Canute IV of Denmark,^[3] and was the mother of Charles the Good, later count of Flanders. She then married Roger Borsa, duke of Apulia.
3. Gertrude, who married Theodoric II, Duke of Lorraine,^[3] and was the mother of Thierry of Alsace, also later count of Flanders.
4. Philip of Loo, whose illegitimate son William of Ypres was also a claimant to the county of Flanders.
5. Ogiva, abbess of Messines.