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.
The Marquess of Carmarthen, as a prominent nobleman, held the seat of Helston in parliament from 1826 to 1830 and was subsequently called to the House of Lords on 2 July 1838, as part of his father's title of Osborne.