The Earl of Portland holds the subsidiary titles of Viscount Woodstock (1689) and Baron Cirencester (1689), both in the Peerage of England. Associated with the Dukedom were the additional titles of Marquess of Titchfield (1716) and Baron Bolsover (1880), which became extinct along with the dukedom in 1990.
Portland entered the House of Commons as MP for Weobley, Hertfordshire in 1761 but succeeded to the peerage on the death of his father the following year and was elevated to the House of Lords.
Portland refused to acknowledge the policy and recalled the Earl in January 1795; one major result was the Irish Rising of 1798 because the Irish felt betrayed by Portland.
Portland did not speak in parliament during his second ministry, which started life under a cloud of military failure during the French Wars: Napoleon dominated most of western Europe and went on to conquer the Iberian peninsula.