William was Chamberlain to Henry I, and was granted by Henry I the Baronyof Hameslape, together with the office of Exchequer to the King, and alllands belonging thereto in Normandy and England, particularly the Castleand Honour of Porchester. He married Maud de Mameslape, whose family nameoriginated from a parish on the border of Buckinghamshire, extending toNorthampton, later called Hameslape. There was a William de Hameslape onthe Humdred rolls of County Bucks, 1273 A. D. Maud's father Michael deHameslape is addressed by King Henry I, in a charter made at Rockinghamabout the year 1101 in favor of the See of Lincoln. He is also mentionedas once lord of the fief which Henry I bestowed on William Malduit; butBank's Dormant and Extinct Baronetcies says, "Mauduit marrying Maude,daughter of Michael de Hameslape, acquired with her the barony ofHameslape in County Buckingham," she being the sole daughter and heir.There seems to be no earlier history of the Hameslape family than themention of the charter in 1101.