Mary de la Poer (born 1889) (b. 1889) Parents Edmond de la Poer, 1st Count de la Poer Mary Monsell Children Siblings Elinor de la Poer Ermyngarde de la Poer Edmond de la Poer-Monsell William de la Poer John de la Poer, 2nd Count de la Poer Partners Arthur Duthie