an , ▁ 1 st ▁Earl ▁Cad og an ▁ 1 7 2 2 – 1 7 2 5 ▁ ▁François ▁de ▁La ▁Ro che f ou ca uld , ▁mar quis ▁de ▁Mont and re ▁ 1 7 2 5 ▁ ▁John ▁Campbell , ▁ 2 nd ▁Duke ▁of ▁Ar gy ll ▁ 1 7 2 5 – 1 7 4 0 ▁ ▁John ▁Mont agu , ▁ 2 nd ▁Duke ▁of ▁Mont agu ▁ 1 7 4 0 – 1 7 4 2 ▁ ▁John ▁Campbell , ▁ 2 nd ▁Duke ▁of ▁Ar gy ll ▁ 1 7 4 2 ▁ ▁John ▁Mont agu , ▁ 2 nd ▁Duke ▁of ▁Mont agu ▁ 1 7 4 2 – 1 7 4 9 ▁ ▁vac ant ▁ 1 7 4 9 – 1 7 5 5 ▁ ▁Charles ▁Sp encer , ▁ 3 rd ▁Duke ▁of ▁Mar l borough ▁ 1 7 5 5 – 1 7 5 8 ▁ ▁vac ant ▁ 1 7 5 8 – 1 7 5 9 ▁ ▁John ▁Lig on ier , ▁ 1 st ▁Vis count ▁Lig on ier ▁ 1 7 5 9 – 1 7 6 3 ▁ ▁John ▁Mann ers , ▁Mar qu ess ▁of ▁Gran by ▁ 1 7 6 3 – 1 7 7 0 ▁ ▁vac ant ▁ 1 7 7 0 – 1 7 7 2 ▁ ▁George ▁Town sh end , ▁ 4 th ▁Vis count ▁Town sh end ▁ 1 7 7 2 – 1 7