Gilbert de Clare, 1st Earl of Hertford

Gilbert Fitz Richard 1st Earl of Hertford 4rd Lord of Clare
Arms of Gilbert de Clare
Hereditary
Earl of Hereford Lord of the Honor of Clare	1138-1152 1136-1152
Predecessor	Gilbert Fitz Richard
Successor	Roger de Clare
Detail Titles and styles 4th Lord of Tonbridge Lord of Cardigan
Family	de Clare
Father	Richard Fitz Gilbert de Clare
Born	1115 Hertford, Hertfordshire, England
Died	1152
Occupation	Peerage of England

Gilbert FitzRichard de Clare, 1st Earl of Hertford (c. 1115–1152), was Lord of Clare and created 1st Earl of Hertford by Stephen, King of England

Gilbert was the eldest son of the Richard Fitz Gilbert de Clare and Adeliza. His mother Adeliza was the daughter of Ranulf le Meschin, 3rd Earl of Chester and Countess Lucy as well as the sister of Ranulf de Gernon, 4th Earl of Chester. Gilbert, who was born before 1115, succeeded his father to the honor of Clare including Tonbridge Castle on 15 Apr. 1136.

He was created Earl of Hertford about 1138, possibly about the same time his uncle was created Earl of Pembroke. He was a supporter of King Stephen for a time, but seems to have joined the Empress Matilda at some point. When the king took Ranulf de Gernon, the Earl of Chester, prisoner the Earl gave his nephew Geoffrey as a guarantor for his liberation and good conduct.

In 1147, Ranulf de Gernon, rebelled against King Stephen again. The king, in turn, seized Gilbert, the Earl of Hertford, and held him prisoner until he agreed to surrender all his castles. After doing so the Earl of Hertford was released, but then joined his uncle Ranulf's rebellion. Gilbert, Earl of Pembroke, who up to this time had remained loyal to Stephen, then demanded his nephew Gilbert's castles 'maintaining that they were his by hereditary right'. When Stephen refused, Gilbert the Earl of Pembroke also joined Ranulph's rebellion. Stephen then confiscated his castles as well. Not long after, however, the king reconciled with both Gilberts, however Ranulf de Gernon joined Henry of Anjou (later Henry II of England).

Gilbert died unmarried and without issue in 1152 and was buried at Clare Priory. He was succeeded by his brother Roger de Clare.