Edward John Moreton Drax Plunkett was born in Ireland, the first son of John William Plunkett, 17th Baron of Dunsany and Ernle Elizabeth Louisa Maria Grosvenor Ernle-Erle-Drax. He spent his childhood at several family properties, including Dunstall Priory in Shoreham, Kent, Dunsany Castle in County Meath, as wells as other family homes such as in London. His schooling was at Cheam, Eton and finally Sandhurst, which he entered in 1896. He became the 18th Baron of Dunsany when his father died in 1899, and he returned to Dunsany Castle in 1901 after war duty. He married Lady Beatrice Child Villiers in 1904. Their child, Randal, was born in 1906.
Edward Plunkett was a writer and dramatist, notable for his work, mostly in fantasy, which he published under the name Lord Dunsany. More than eighty books of his work were published, and his oeuvre includes many hundreds of published short stories, as well as successful plays, novels and essays.