Research Notes:
Collins states, [1]
William Brudenell, of Aynho, married Agnes, daughter and heir of Thomas de la Grove, by Alice his wife, daughter and heir of Walter de Raan, and of Margery his wife, daughter, and at length, heir of John Blakett, of Castleton and Saltford, in the county of Oxford. By this heiress, the said William de Brudenell added to his paternal estate the lordships of Raans, Colshill, and divers lands in Agmondesham, in the county of Buckingham; and other manors and lands in the counties of Oxford, Hereford, and Essex. He had issue three sons, Edmund, William, and Henry, as also a daughter Margaret; and lies buried with Agnes his wife, in the church of Agmondesham, under an old monument in the south aisle, whereon the arms of Brudenell and Raans are impaled, but the epitaph is long since defaced.
[1] Arthur Collins, The Peerage of England: Containing a Genealogical and Historical Account of all the Peers of England, Third Edition, Vol. 2 (London: W. Innys and J. Richardson, 1756), 380, [HathiTrust].