The paper discusses the work "The Duchesse of Cornwall's progresse to see the Land's end & to visit the mount" written by Nicholas Boson between 1660 and 1670, which was predominantly in English with occasional passages in Cornish. It has not survived in its entirety but only as passages quoted by Edward Lhuyd and William Borlase. The Progresse was written for the amusement of Boson's children and as a way of teaching them the Cornish language and its history. The identity of the Duchess in the Progresse has been a topic of discussion, with suggestions ranging from a pre-Reformation figure to Catharine of Braganza. The purpose of the work was to entertain Boson's children and teach them the Cornish language and its history, possibly inspired by William Scawen's efforts to revive the language.