Margaret of Brieg (1342–1386) was a daughter of Ludwik I the Fair and his wife, Agnes of Sagan.
Her brother was Henry VII of Brzeg and her sister, Hedwig was married to Jan II of Oświęcim.
Margaret's maternal grandparents were Henry IV the Faithful and Matilde of Brandenburg.
Her paternal grandparents were Bolesław III the Generous and his first wife Margaret of Bohemia.
[1] Albert kept mistresses and lovers, but during his reign, troubles erupted between parties because of a woman, Aleid van Poelgeest.