As Marquess of Carmarthen, he held the parliamentary seat of Helston from 1826 to 1830 and on 2 July 1838, was summoned to the House of Lords in his father's barony of Osborne.
As Marquess of Carmarthen, he occupied the parliamentary position of Helston from 1826 to 1830 and on 2 July 1838, was summoned to the House of Lords in his father's barony of Osborne.