Saint Oliver Plunket (1 November 1625 - 1 July 1681 (O.S.)) was Archbishop of Armagh and Primate of All Ireland.
He was born at Loughcrew, Oldcastle, Co Meath, related to several titled Irish families. After being accused (probably falsely) of plotting against King Charles II by Titus Oates, he was hanged, drawn and quartered at Tyburn, London. After his death, his arms were severed and are now preserved as relics in Drogheda. The rest of the body was initially interred in the courtyard of St. Giles, exhumed in 1683 and moved to the Benedictine monastery at Lamspringe, near Hildesheim in Germany. The head was brought to Rome, and from thence to Armagh and eventually to Drogheda at St. Peter’s Church on 29 June 1921. The body was brought from Lamspringe to Downside Abbey, England in 1883; some of these were brought to Ireland in May 1975. Other relics and souvenirs are in Britain, France, Germany, America, and Australia.