He was born either in the townland of Pallas, near Ballymahon, County Longford, Ireland, where his father was the Anglican curate of the parish of Forgney, or at the residence of his maternal grandparents, at the Smith Hill House in the diocese of Elphin, County Roscommon where his grandfather Oliver Jones was a clergyman and master of the Elphin diocesan school, and where Oliver studied.