Margaret of Lancaster was a notable figure in the late 14th century, born around 1340. She was the daughter of Henry of Grosmont, the 1st Duke of Lancaster, and Isabel de Beaumont. Margaret played a significant role in the political landscape of her time, particularly through her marriage to John of Gaunt, the Duke of Lancaster, which strengthened the ties between the Lancaster and Plantagenet families. Margaret's life was marked by her involvement in the royal court and her influence on her children, including Henry IV of England. She was known for her piety and charitable works, contributing to various religious institutions. Margaret passed away in 1399, leaving a lasting legacy in English history.