Peter Fitz-Herbert, Baron of Barnstable in Devonshire, the honor of whichhe obtained from King John with fifteen knight's fees, part of the landsof William de Braose, and he was made Governor of Pickering Castle inYorkshire, and Sheriff of that county by the same monarch. This Peter wasone of the barons named in Magna Carta and, by his signature, fourth inrank amongst the barons. He m. first, Alice, dau. of Robert Fitz Roger, agreat baron in Northumberland, Lord of Warkworth and Clavering, andsister of John, to whom Edward I gave the surname of Clavering, Lord ofCallaly in Northumberland. By this lady he had a son and heir, ReginaldFitz Peter. He m. secondly, Isabel, dau. and coheir of William de Braose,and widow of David Llewellin, Prince of Wales, and by the allianceacquired the lordships and castle of Blenlevenny and Talgarth in thecounty of Brecknock, with other possessions in Wales. He fortified hiscastle of Blenlevenny, and, dying in 1235, was s. by his son, ReginaldFitzPeter, Lord of Blenlevenny, [John Burke, History of the Commoners ofGreat Britain and Ireland, Vol. IV, R. Bentley, London, 1834, p. 728,Jones, of Llanarth]
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Peter Fitz-Herbert, who, being very obsequious to King John, was reputedone of that prince's evil counsellors. In 1214, he was constitutedgovernor of Pykering Castle, co. York, and sheriff of the shire; butafterwards falling off in his allegiance, his lands at Alcester wereseized by the crown, and given to William de Camvill. Returning, however,to his duty upon the accession of Henry III, those lands were restored tohim. He m. 1st, Alice, dau. of Roger Fitz-Roger, a great baron inNorthumberland, but by her had no issue; and 2ndly, the 3rd dau. andco-heir of William de Braose, Baron of Brecknock, and d. 1235, leaving ason, Herbert Fitz-Peter. [Sir Bernard Burke, Dormant, Abeyant, Forfeited,and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 206,Fitz-Herbert, Baron Fitz-Herbert]
NOTE: Brian Tompsett has him married to Isabel de Ferrieres (de Ferrers)rather than to Isabel de Braose.