Isabella Courtenay born 1740; died 1805 April 22 (1740–1805) Parents Elizabeth Montagu Kelland Courtenay Children William Stephen Poyntz Charles Courtenay Poyntz Georgina Poyntz Charlotte Louisa Poyntz Isabella Henrietta Poyntz Mordaunt Montagu Poyntz Carolina Amelia Poyntz Siblings Anne Courtenay Charles Kelland Courtenay Partners William Poyntz