Mary Agnes Windsor-Clive (1856-1923) (1856–1923) Parents Lady Mary Selina Louisa Bridgeman Robert Windsor-Clive Children Margery Gertrude Knowsley Thornton Clive Knowsley Thornton Siblings Robert Windsor-Clive, 1st Earl of Plymouth Henrietta Lucy Windsor-Clive Georgina Harriet Charlotte Windsor-Clive Partners John Knowsley Thornton