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.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)