She was the youngest daughter of Simon III, Count of Saarbrücken, who was succeeded upon his death by her sister Lauretta.

Lauretta had one daughter and one son, but as both died early, she was succeeded by her younger sister, Mathilde.

It is not clear if Simon actually was a Seigneur of Commercy, but at least the title came to his descendants.

As a widow Mathilde married in c.1248 to Amadeus (fr) (d. 1280), Seigneur (lord) of Montfaucon.

This biography of a member of a European royal house is a stub.