After the defeat of Harold II during the Norman conquest of England, William I granted the Hundred of Salford to Roger the Poitevin, and in the "Domesday Book" of 1086 the Hundred of Salford was recorded as covering an area of with a population of 35,000. Poitevin created the subordinate Manor of Manchester out of the hundred, which has since in local government been separate from Salford. Poitevin forfeited the manor in 1102 when he was defeated in a failed rebellion attempt against Henry I. In around 1115, for their support during the rebellion, Henry I placed the Hundred of Salford under the control of the Earldom of Lancaster, and it is from this exchange that the Hundred of Salford became a royal manor. The Lord of the Manor was either the English monarch, or a feudal land owner who administered the manor for the king. During the reign of Henry II the Royal Manor of Salford passed to Ranulf de Gernon, 4th Earl of Chester.