He also fought as a Royalist in the Civil War and notably commanded the cavalry at the First Battle of Newbury in 1643.

His eldest son, the fourth Earl, also served as Constable of the Tower of London and as Lord Lieutenant of Warwickshire.

They had no sons and Lord Northampton was succeeded in the barony of Compton, which could be passed on through female lines, by his daughter Lady Charlotte.

Lord Northampton died childless at an early age and was succeeded by his younger brother, the eighth Earl.

He briefly represented Northampton in the House of Commons before he inherited the earldom and also served as Lord Lieutenant of Northamptonshire.

His son, the ninth Earl, sat as Member of Parliament for Northampton and served as Lord Lieutenant of Northamptonshire.

Lord Northampton married Margaret Douglas-Maclean-Clephane, daughter of Major-General Douglas Maclean Clephane.

Lord Northampton assumed in 1851 by Royal licence the additional surname of Maclean and in 1878 upon succeeding to the titles that of Douglas.

He represented Stratford-on-Avon and Barnsley in Parliament as a Liberal and served as Lord Lieutenant of Warwickshire.

As of 2017[update], the titles are held by his grandson, the seventh Marquess, who succeeded his father in 1978.

The latter married as his first wife Sylvia, daughter of Alexander Haldane Farquharson.

Their two major estates are Castle Ashby House in Northamptonshire and Compton Wynyates in Warwickshire.