Robert de Clare was a notable figure in medieval England, known for his role as a nobleman and military leader. He was born around 1160 and became the 3rd Earl of Gloucester. His family was influential, and he played a significant part in the political landscape of the time, often aligning with powerful factions. De Clare was involved in various conflicts, including the Angevin Empire struggles and the Civil War during the reign of King Stephen. His contributions to military campaigns and his noble lineage made him a key player in the feudal system of England during the 12th century.