Duke of Clarence and Avondale
Duke of Clarence and Avondale was a title awarded to Prince Albert Victor, a grandson of Queen Victoria, in the Peerage of the United Kingdom. Whilst there had previously been several creations of Dukes of Clarence (and one Duke of Clarence and St Andrews), the sole creation of a dukedom of Clarence and Avondale was for Albert Victor, the eldest son of the Prince of Wales (later King Edward VII).
Source: Wikipedia — Duke of Clarence and Avondale (CC BY-SA 4.0)