æz vˈaɪkaʊnt dˈʌŋkænən, hiː sˈæt ɪnðə hˈaʊs ʌv kˈɑːmənz æz mˈɛmbɚ fɔːɹ nˈɛɹsbəɹˌoʊ fɹʌm wˈʌn θˈaʊzənd sˈɛvənhˈʌndɹɪd ˈeɪɾi ʌntˈɪl hɪz səksˈɛʃən tə hɪz fˈɑːðɚz ˈɜːldəm.
As Viscount Duncannon, he sat in the House of Commons as member for Knaresborough from 1780 until his succession to his father's earldom.