In the early 1070s, a few years after the [[Normans|Norman conquest]] in 1066, the land between the Ribble and Mersey, with the addition of Amounderness, was granted by [[William the Conqueror]] to [[Roger of Poitou]]. On the order of Roger of Poitou, [[motte-and-bailey]] [[castle]] was built at [[Penwortham]] (immediately south of the River Ribble from Preston), to guard the Ribble estuary and a ford crossing the river. | In the early 1070s, a few years after the [[Normans|Norman conquest]] in 1066, the land between the Ribble and Mersey, with the addition of Amounderness, was granted by [[William the Conqueror]] to [[Roger of Poitou]]. On the order of Roger of Poitou, [[motte-and-bailey]] [[castle]] was built at [[Penwortham]] (immediately south of the River Ribble from Preston), to guard the Ribble estuary and a ford crossing the river. |