ใครแต่งงานกับGertrude of Saxony?

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.

Floris I (born c. 1017 in Vlaardingen – 28 June 1061) was count of Holland, then called Frisia west of the Vlie, from 1049 to 1061.

Floris was born in Vlaardingen. He was a son of Dirk III and Othelindis of Nordmark. Floris succeeded his brother Dirk IV, who was murdered in 1049. He married c. 1050 Gertrude, daughter of Duke Bernard II of Saxony, and had at least three children with her: Dirk V (c. 1052–1091), Bertha (c. 1055–1094), who became queen of France, and Floris (born c. 1055), who became a canon at Liége.

Floris was involved in a war of a few Lotharingian vassals against the imperial authority. On a retreat from Zaltbommel he was ambushed and killed in battle at Hamerth on 28 June 1061. His son Dirk V succeeded him. In 1063 Gertrude married Robert I of Flanders, who ruled Frisia as regent and acted as guardian for her children with Floris.

Robert I (c. 1035 – 13 October 1093), known as Robert the Frisian, was count of Flanders from 1071 until his death in 1093. He was a son of Baldwin V, Count of Flanders, and the younger brother of Baldwin VI, Count of Flanders. He usurped the countship after defeating his nephew Arnulf III and his allies, which included King Philip I of France, Count Eustace of Boulogne and the counts of Saint-Pol and Ardres at the Battle of Cassel. He subsequently made peace with Philip, who became his stepson-in-law, but remained hostile to his sister Matilda and her husband William the Conqueror, who was king of England and duke of Normandy.