Hugh de Lacy, 1st Earl of Ulster, was a prominent Anglo-Norman nobleman in the 12th century. He played a significant role in the English conquest of Ireland and was granted the title of Earl of Ulster in 1177. His leadership helped establish Norman control in the region, and he was known for his military prowess and administrative skills. De Lacy was a key figure in the de Lacy family, which was influential in both England and Ireland. He built several castles, including Carrickfergus Castle, to strengthen his hold on the territory. His legacy continued through his descendants, who maintained power in Ireland for generations.