Lord Marcus Beresford British racing manager (1848-1922) (1848–1922) Parents Christiana De La Poer Beresford, Marchioness of Waterford John Beresford, 4th Marquess of Waterford Children Siblings John Beresford, 5th Marquess of Waterford Lord William Beresford Charles Beresford Delaval James de la Poer Beresford Partners Louisa Catherine Ridley