HORN-CASTLE, a town of Lincolnshire in England. It had a castle, as the name imports; from the architecture of which, and the Roman coins that are sometimes dug up here, it is thought to have been a camp or station of the Romans. The town is well built, and is almost surrounded with water. It is a signiory of 13 lordships. In these lordships there are several chapels for the convenience of the inhabitants, who are at too great a distance from the mother-church, and pretty numerous. It has a market on Saturdays, and fairs in June and August.