A gift from King Charles

During his state visit to France this week, Charles presented President Macron with a copy of the Voltaire Foundation's edition of the Lettres sur les Anglais (with the rest of the 205 volumes of Complete works to follow!).

King Charles presents President Macron with Voltaire Foundation research on Voltaire’s work - Voltaire Foundation (ox.ac.uk)

Did Charles once translate Zadig, or have I only imagined this?