Sir William Courtenay was educated at Westminster School and graduated from Magdalen College, Oxford University in 1731 with a Master of Arts.
He held the office of Member of Parliament for Honiton as a Tory between 1734 and 1741 and for Devon from 1741 to 6 May 1762, when he was created 1st Viscount Courtenay of Powderham Castle.
[1] He married on 2 April 1741 Lady Frances Finch (d.1761), daughter of Heneage Finch, 2nd Earl of Aylesford by his wife Mary Fisher (1690-1740), daughter and heiress of Sir Clement Fisher, 3rd Baronet (d.1729) of Packington Hall, Warwickshire.
His seats in Devon were Powderham Castle, which he greatly remodelled, and Forde House, Wolborough, near Newton Abbot.
The Courtenay motto is shown underneath: Ubi lapsus quid feci ("Where did I slip what have I done").