Biela was the daughter of Edmond Beissel von Gymnich and Bela von Bunebach. The date and place of her birth have not been found.
Her husband was Karl III von Metternich, who she married on 3 MAY 1456. The place has not been found. Their four known children were Agnes (?-1516), Sibilla (?-1516), Dieter I (c1496-c1528) and Edmund (<1498-1541/42).