[3] After his birth, his mother was sent out to become a Nun in the English Priory of St. Nicholas, at Pontoise in Normandy, France, taking the name Sister Benedicta, where she later became prioress in 1721.
Charles Courteney was a descendant of Francis Courtenay, de jure 4th Earl of Devon.
There is a strong possibility that it was a genuine title bearing in mind he was from exceptional lineage and even related to the Kings of France.
Therefore with this close relationship between him and the Kings of France the strong likelihood is that it was a genuine title, although there is little evidence to prove this.
Hamilton also wrote a book, "Transactions During the Reign of Queen Anne, From the Union to the Death of that Princess" which was posthumously published by his son in 1790.