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Edmund was born at Berkhamsted Castle on 26 December 1249, the second and only surviving son of Richard, 1st Earl of Cornwall and his wife Sanchia of Provence, daughter of Ramon Berenguer, Count of Provence, and sister of Henry III's queen, Eleanor.
While negotiating a peace accord, John was at first held in the Savoy Palace, then at a variety of locations, including Windsor, Hertford, Somerton Castle in Lincolnshire, Berkhamsted Castle in Hertfordshire, and briefly at King John's Lodge, formerly known as Shortridges, in East Sussex.