Margaret, described having been a good-natured, merry child in her youth, was unhappy at the Brabant court, as she was forced to accept her husband's perennial succession of mistresses and the illegitimate children they bore him; all of whom were raised at court alongside her own son, John. The latter was her only child, born 10 years after her marriage to the Duke.
Richardson, Douglas, Everingham, Kimball G. (2004). Plantagenet Ancestry: a study in Colonial and Medieval Families. Baltimore: Genealogical Publishing Company. p.20. Google Books. Retrieved 25-11-10