His great-grandson, Sir Thomas Brudenell, was created a Baronet in the Baronetage of England, styled "of Deene in the County of Northampton", on 29 June 1611.

[2] On 26 February 1628, he was raised to the Peerage of England as Baron Brudenell, of Stanton Wyvill in the County of Leicester.

In 1766, he was created Marquess of Monthermer and Duke of Montagu in the Peerage of Great Britain, revivals of the titles which had become extinct on his father-in-law's death in 1749.

The earldom, barony of Brudenell and baronetcy passed to the Duke's younger brother, James, the 5th Earl, who already on 17 October 1780 had been created Baron Brudenell, of Deene in the County of Northampton, in the Peerage of Great Britain, in his own right.

He was childless and on his death in 1868 the titles were inherited by his second cousin, George, 2nd Marquess of Ailesbury, grandson of Thomas Brudenell, the fourth and youngest son of the 3rd Earl.

The Earldom remains visible, however, as it is used as a courtesy title by the heirs apparent to the Marquessate.