Gilbert de Clare
1180 – 1230
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Gilbert de Clare, fourth Earl of Hertford and first Clare Earl of Gloucester, was one of the twenty-five barons appointed in 1215 to hold King John to Magna Carta, as his father had been before him. Father and son among the twenty-five is a rare thing. He married Isabel Marshal, daughter of the greatest knight of the age, and he is buried in the choir at Tewkesbury Abbey, before the high altar.
Research notes
✓ DOCUMENTED (Entered 23 Jul 2026 under the relaxed rule (standard, undisputed peerage/royal account; provenance so noted).): GILBERT DE CLARE, 4TH EARL OF HERTFORD AND 1ST (CLARE) EARL OF GLOUCESTER (b. ~1180); **A MAGNA CARTA SURETY BARON, 1215 - as was his father: father and son among the twenty-five together**; d. in Brittany 25 Oct 1230. m. 9 Oct 1217 ISABEL MARSHAL. Direct ancestor - the tree's THIRD wired surety (with his father below and Robert de Vere 3rd Earl of Oxford, I99530). Added 23 Jul 2026.