MOUNTJOY (or MoNTJoY), BARONS AND VISCOUNTS  . Sir Walter Blount (d . 1474), of Elvaston, Derbyshire, grandson of Sir Walter Blount, who was an adherent of John of Gaunt, succeeded his father, Sir Thomas Blount, as treasurer of Calais in 1460, becoming governor a year later as a reward for service rendered to King Edward IV. at the battle of Towton . Edward conferred on him rich estates forfeited by the earl of Devon; and in 1465 Blount was made lord high treasurer and created Baron Mountjoy . This creation is noteworthy as one of the earliest examples of a baronial title not being of a territorial character; nor the title of a dignity already existing . Blount's great-grandfather had married Isolda, daughter and heiress of Sir Thomas de Mountjoy, and the title was probably chosen to commemorate this alliance .