ランカスター公
Sometime between 1351 and 1361, Henry of Grosmont, 1st Duke of Lancaster, whose duchy held the rights to the property, released the friars from their annual rent of 3s 9d and awarded them a grant of land to extend the house. This grant was confirmed by John of Gaunt, Duke of Lancaster in 1363 and Henry IV, in his capacity as Duke of Lancaster, in 1404. Despite this close Lancastrian connection, this is no evidence to suggest the friars were involved politically with the faction during the ensuing Wars of the Roses.