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 older than her. Despite the difference in ages, it was the only marriage among the Queen’s children in which both partners lived long enough to celebrate their golden wedding anniversary. For nearly sixty years Helena was a tireless supporter of good causes, particularly in the field of nursing and education. This concise biography examines her life, work and relationships with her family.