Arthur Henry Dillon, 18th Viscount Dillon of Costello-Gallin (1875-1934) (1875–1934) Parents Conrad Adderly Dillon Ellen Lousia Dashwood Children Siblings Eric Dillon, 19th Viscount Dillon Evelina Victoria Dillon Hilda Ellen Dillon Margaret Sophia Dillon Vere Mary Dillon Partners Hilda Dillon (née Brunner), Viscountess Dillon