 Her mother was formally invested as "suo jure" 1st Countess of Lincoln on 27 October 1232 the day after her uncle's death.Likewise her mother Hawise of Chester received permission from King Henry III to grant the Earldom of Lincoln jointly to Margaret and her husband John, and less than a month later a second formal investiture took place, but this time for Margaret and her husband John de Lacy.Margaret became 2nd Countess of Lincoln "suo jure" (in her own right) and John de Lacy became 2nd Earl of Lincoln by right of his wife.