Penwortham Castle was built on the south bank of the River Ribble, at Penwortham to the west of Preston, Lancashire, England, at . The site is a Scheduled Ancient Monument. It was built shortly after the Norman conquest as a motte castle by Roger of Poitou. It served to guard the estuary of the river and a ford crossing it. When Roger built Lancaster Castle, Penwortham declined in importance. Now only the mound remains.
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