[1] She was the fourth child and daughter of Mathilde of Flanders and Henry I, Duke of Brabant.

She married Henry II, Count Palatine of the Rhine (died 1214) in Aachen in 1212.

When her spouse was killed at a tournament at Corbie in 1234, their eldest son William was only seven years old.

[1] Instead, her sons' paternal uncles William and Otto, bishop of Utrecht, were his guardians until 1239.

After her son attained legal majority Mathilde stepped forward to assume an active role in his court and household, and became a prominent benefactor of abbeys and various institutions.