In 1917 Alastair lost the title of a British prince and the style of courtesy title he had as heir to his mother's dukedom, until 1942, when he inherited his grandfather's dukedom and became Duke of Connaught and Strathearn.
In 1917 Alastair lost the title of a British prince and the style of "Highness". After that, he was known as the Earl of Macduff, this being the courtesy title he had as heir to his mother's dukedom, until 1942, when he inherited his grandfather's dukedom and became Duke of Connaught and Strathearn.