Olivia Melian Durdin-Robertson (13 April 1917 – 14 November 2013[1]) was an author, artist, co-founder and high priestess of the Fellowship of Isis.

Her family lived in Reigate in Surrey before moving back to their ancestral home Huntington Castle in Ireland, which had been inherited in 1925 on the death of her grandmother.

Huntington castle had been previously seized by the Irish Republican Army to use as their headquarters around the year 1916 when the Anglo-Irish War was in its early beginnings.

On 30 April 1988 she appeared as a guest on After Dark, a British late night live discussion programme broadcast on Channel 4.

Her funeral was a private ceremony held in the temple, organised by the Fellowship of Isis, followed by a public Church of Ireland service at St Fiacc's in Clonegal.