An Oxford DNB article about the Beauchamp family states, [1]
Simon [ii] de Beauchamp held the Bedford barony for over fifty years, including a nine-year minority. … Simon was succeeded by his son, William de Beauchamp (c.1185-1260) …
[1] Kathryn Faulkner, "Beauchamp, de, family (per. c.1080–c.1265)," Oxford Dictionary of National Biography (Oxford University Press, 2004, online edition), [Oxford_Dictionary_National_Biography], [OxfordDNB(UM)].