de Lacy is a surname of Anglo-Norman origin, often associated with historical figures in England. The name is most notably linked to the de Lacy family, who were prominent landowners and nobles during the medieval period. They held significant estates, particularly in Cheshire and Yorkshire, and played a role in the political landscape of the time. The most famous member of the de Lacy family was Henry de Lacy, the 3rd Earl of Lincoln, who lived in the 13th century. He was known for his loyalty to the English crown and his involvement in various military campaigns. The family's legacy is reflected in several historical sites and documents that highlight their influence in medieval England.