Richilde was the daughter of Folmar I de Bliesgau but her mother is unknown. The date and place of her birth have not been found.
Her husband was Théodoric I de Bar-le-Duc. They were married, but the date and place have not been found. Their four known children were Frédéric II (c0995-c1026), Gisèle (?-?), Adèle (?-0995) and Hermann I (?-?).