Princess Helena (1846-1923) was the third daughter of Queen Victoria and Prince Albert. A steady, dependable young woman, known as 'Lenchen' within the family, she was particularly 'useful' to her demanding and recently widowed mother, who could not bear to lose her to a marriage which would oblige her to move and live abroad with her husband. In 1866 she married Prince Christian of Schleswig-Holstein, a kindly but penniless bachelor fifteen years...