Thomas de Clare, 1st Earl of Hertford, was an English nobleman born around 1290. He was the son of Richard de Clare, 6th Earl of Gloucester and Maud de Lacy. Thomas became the 1st Earl of Hertford in 1337, a title that reflected his significant status in the English aristocracy. He was known for his military service and involvement in the Hundred Years' War. Throughout his life, Thomas de Clare held various lands and titles, contributing to his wealth and influence. He was married to Margaret de Quincy, and they had several children, ensuring the continuation of his lineage. His legacy is tied to the history of the English nobility during the 14th century.