William, 3rd Viscount Mountjoy
WILLIAM, 3RD VISCOUNT MOUNTJOY (1709-1769), was in 1745 created earl of Blesington, his mother having been sister and sole heiress of Charles, 2nd and last Viscount Blesington. On his death without issue in 1769 all his titles became extinct. Anne Stewart, daughter and heiress of Alexander Stewart, second son of the above-mentioned William, 1st Viscount Mountjoy, married Luke Gardiner, vice-treasurer of Ireland; and her grandson, Luke Gardiner (1745-1798), who inherited a large portion of the Mountjoy family estates, was created Baron Mountjoy of Mountjoy, Co. Tyrone (1789), and Viscount Mountjoy (1795), both in the peerage of Ireland; but on the death without male issue in 1829 of his son Charles John, who in 1816 was created earl of Blesington, all these titles again became extinct.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)