Robert's son William inherited most of his land and was attainted of treason and all his lands were forfeited to the Crown. In 1206 the manor was in the hands of, in fee, of William Rivers, Earl of Devon. In 1228 Hubert de Burgh surrendered his rights in Kempton to the king: these rights possibly arose from a projected marriage between Hubert and Joan of Devon but the marriage did not take place. Administration of Feltham manor became merged with Kempton during this period, or possibly even earlier. A variant name of "Kenton", now used in Kenton Avenue appears in John Speed's Middlesex map of 1611. Kempton does not appear at all in a place finder map of 1819 of the environs of London. In 1222 The Dean and Chapter of St. Paul's appropriated Sunbury's church, ordaining a perpetual and well-endowed vicarage; they sold the rectory estate after the building of a new church in 1799 to the owner of Kempton manor, for poor provision of glebe existed in 1957.