Duke of Kent equerry marries Duchess ' Lady in waiting . Duke as best man . The Duke of Kent , was best man , for , Lord Herbert , his equerry for his wedding to Lady Mary Hope , Lady in waiting to the Duchess of Kent at Westminster Abbey . The Duchess of Kent and the Duke and Duchess of Gloucester were guests at the ceremony . Lord Herbert is the eldest son of the Earl of Pembroke and Lady Mary Hope , a sister of the Marquis of Linlithgow , Viceroy of India . Photo shows , the Duke and Duchess of Kent and the Duke and Duchess of Gloucester ( with their backs to camera ) leaving after the ceremony . 27 July 1936