Sir Richard FitzGilbert DE CLARE 1st Earl of Hertford
- Born: 1094, Clare, Risbridge, Suffolk, England
- Married: Bef 1115
- Died: 15 Apr 1136, New Abergavenny, Monmouthshire, England
- Buried: Gloucester, Gloucestershire, England
He founded the priory of Tonbridge.
Richard held the lordship of Ceredigion in Wales. A Welsh revolt against Norman rule had begun in south Wales, where on 1 January 1136 the Welsh won a victory over the local Norman forces between Loughor and Swansea. Richard had been away from his lordship in the early part of the year. Returning to the borders of Wales in April, he ignored warnings of the danger and pressed on towards Ceredigion with a small force. He had not gone far when he was ambushed and killed by the men of Gwent under Iorwerth ab Owain and his brother Morgan, grandsons of Caradog ap Gruffydd, in a woody tract called "the ill-way of Coed Grano", near the Abbey of Lanthony, Abergavenny.
The news of Richard's death induced Owain Gwynedd, son of Gruffydd ap Cynan, king of Gwynedd to invade his lordship. In alliance with Gruffydd ap Rhys of Deheubarth he won a crushing victory over the Normans at the Battle of Crug Mawr, just outside Cardigan. The town of Cardigan was taken and burnt, and Richard's widow, Adelize, took refuge in Cardigan Castle, which was successfully defended by Robert fitz Martin. She was rescued by Miles of Gloucester who led an expedition to bring her to safety in England.
Richard married Adeliz (Alice) LE MESCHIN, daughter of Ranulph "De Briquessart" LE MESCHIN 1st Earl of Chester and Lucia of Mercia, before 1115. (Adeliz (Alice) LE MESCHIN was born about 1102 in Chester, Cheshire, England and died after 1142.)