His parents were Arthur Edward Knox of Castlereagh, near Killala, County Mayo, (later Trotton House, Sussex) and Jane Parsons, daughter of Laurence Parsons, 2nd Earl of Rosse.
His parents were Arthur Edward Knox of Castlereagh, near Killala, County Mayo, (later Trotton House, Sussex) and Jane Parsons, daughter of Laurence Parsons, 2nd Earl of Rosse.