Who was William I wife?
Matilda of Flanders
Matilda of Flanders (French: Mathilde; Dutch: Machteld) (c. 1031 – 2 November 1083) was Queen of England and Duchess of Normandy by marriage to William the Conqueror, and sometime Regent of these realms during his absence. She was the mother of ten children who survived to adulthood, including two kings, William II and Henry I.
William I, Landgrave of Lower Hesse
His parents were Louis the Frank (1438–1471) and Mechthild, daughter of Count Louis I of Württemberg. On 17 February 1488 in Münden, he married Anna of Brunswick-Wolfenbüttel c. 1460 - Worms 16 May 1520], daughter of William II, Duke of Brunswick-Wolfenbüttel and Elisabeth, Countess of Stolberg, with whom he had five daughters: