Margaret de Quincy was a notable figure in the 13th century, known for her role as the Countess of Lincoln. Born around 1200, she was the daughter of David de Quincy, the 2nd Earl of Winchester. Margaret married John de Lacy, the 5th Earl of Lincoln, which strengthened political alliances during a tumultuous period in England. As a countess, Margaret played a significant role in managing her estates and supporting her husband's political endeavors. She was involved in various charitable activities and was known for her piety. Margaret's legacy continued through her children, who maintained her family's influence in English nobility.