Aremgarde was the daughter of unknown parents. The date and place of her birth have not been found.
Her husband was Guillaume I de Parthenay. They were married, but the date and place have not been found. Their five known children were Simon I (1047-1075), Joscelin II (?-1086), Gelduin (?-1093), Ebbon (1110-?) and Béatrice (?-?).