From a book on the history of the Yorkshire area:
* * *In the time of John of Gaunt, Duke of Lancaster, the following curious grant was given . . . "Bradford belonged to John of Gaunt, who granted to John Northorp, of Manningham, and his heirs, three messuages and six bovates of land, to come to Bradford on the blowing of a horn in winter, and to wait upon him and his heirs on their way from Blackburnshire, with a lance and hunting dog for thirty days; to have for yeoman's board one penny for himself, and a half-penny for his dog. A descendant of this Northorp afterwards granted land to Rushworth of Horton to hold the lance, while Northorp's man blew the horn. The name of Hornmen or Horn blower's lands, was imposed upon the lands in question, and the custom is still kept up. A man comes into the market place with a horn, a halbert, and a dog; he is there met by the owner of the lands in Horton. After the proclamation made the former calls out aloud, " Heirs of Rushworth, come hold me my hound, while I blow three blasts with my horn, to pay the rent due to our sovereign lord the King." He then delivers the string to the man from Horton, and winds his horn thrice.
* * *(Curator: messuage = a dwelling-house and includes outbuildings, orchard, or courtyard and garden; bovate = old land measurement formerly used in Scotland and England. It averaged around 20 English acres.)
-- The civil, ecclesiastical [&c.] history of Leeds, Halifax, Huddersfield ... and the manufacturing district of Yorkshire, vol. 1, Edward Parsons (Leeds: Frederick Hobson, 1834), p. 222