Baron Bolsover

[1] It was created on 23 April 1880 (as Baroness Bolsover) for Augusta Cavendish-Bentinck, with remainder to the heirs male of the body of her late husband Lieutenant-General Arthur Cavendish-Bentinck, younger son of Lord Charles Bentinck, third son of William Cavendish-Bentinck, 3rd Duke of Portland.

Lady Bolsover was the daughter of the Very Reverend Henry Montague Browne, Dean of Lismore, second son of James Caulfeild Browne, 2nd Baron Kilmaine.

[2] She was succeeded according to the special remainder by her stepson William Cavendish-Bentinck, 6th Duke of Portland, who became the second Baron Bolsover.

He was the only child from Arthur Cavendish-Bentinck's first marriage, to Elizabeth Sophia Hawkins-Whitshed.

The dukedom was passed on to a cousin while the barony became extinct.