Thurstan de Spenser, who appears, with his brother to have taken arms with the other barons against King John, for in the 18th of that reign, the king committed the custody of Thurstan de Spenser to Rowland Bloit, and gave the lands of Almaric de Spenser to Osbert Giffard his own natural son. Thurstan seems to have regained his rank in the next reign, and to have twice served the office of Sheriff of Gloucestershire.