Robert of Torigny records that "Rogerius frater eius" succeeded on the death in 1153 of "Gislebertus filius Ricardi".
He succeeded his brother in 1153 as Earl of Hertford. A charter in the Stoke-by-Clare Priory Cartulary includes the reference "Rogerus coms Clar’ Aelicie de Clermunt ave sue...".
Robert of Torigny records the death in 1173 of "Rogerius comes de Clara". 1
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He [Roger de Clare] married Maud, daughter and heir of James DE ST. HILARY, by his wife Aveline. He died in 1173. His widow for the soul of her husband, Roger de Clare, Earl of Hertford, and for the souls of her ancestors, confirmed to the monks of Eynsham the gifts of Henry and of Roger FitzGerold.... 2
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Roger resumed the the campaign against the Welsh in Cardigan where, after 8 years, he was defeated in 1165. However, Roger did add some lands and nine knights' fees through his marriage to Maud, daughter and heir of the Norfolk baron James de St. Hillary. Roger died in 1173 and his widow, Maud, conveyed the remainder of the inheritance to her next husband, William de Aubigny, Earl of Arundel. The Clare estates along with the earldom passed to Roger's son, Richard, who for the next 4 decades until he died in 1217, was the head of the great house of CLARE, adding immensely to the wealth, prestige, and landed endowment of his line.
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