The village is relatively more recent than those around it, and it started out in life as a castle belonging to the
lord of the manor of nearby
Hanslope. A settlement of
servants and manual workers grew up around the castle and this became the village of Castlethorpe (
thorpe is an
Old Norse language (particularly Danish) word for
homestead, and it is not unreasonable to assume that there may well have been a Danish settlement nearby as the area was, if not part of, certainly close to, the
Danelaw). The castle was damaged in 1215 in a feud between
Foulkes de Brent who had been sent by
King John and William Mauduit, the castle's owner.
Listed buildings and structures The parish has one
scheduled ancient monument (Castlethorpe Castle), one grade I
listed building (the Church of St Simon and St Jude), and twenty grade II. ==Ecclesiastic parish==