HEYDON, a small well-built town in the east riding of Yorkshire, in that part called Holderness, seated on a river that falls into the Humber. It has now but one church, though there are the remains of two more; and had formerly a considerable trade, which is now lost, on account of its being so near Hull. It sends two members to parliament. W. Long. o. 55. N. Lat. 53. 46.