Lancelot’s mother in La Tavola Ritonda.
Unlike her counterpart in most romances, Elaine, Gostanza was still pregnant with Lancelot when her husband, King Ban of Benoic (Ban of Benwick), died. In her distress over her husband’s death, she delivered Lancelot two months early and died herself after a few days.
Source
La Tavola Ritonda | 1325–1350