Walpole, Horace Syllabification: (Wal·pole, Horace)Pronunciation: /ˈwôlˌpōl/Definition of Walpole, Horace 4th Earl of Orford (1717–97), English writer and politician; son of Sir Robert Walpole. He wrote The Castle of Otranto (1764), one of the first Gothic novels. Walpole, Horace in other Oxford dictionaries Definition of Walpole, Horace in the British & World English dictionary