The 1623 printing of François de Lauze’s Apologie de la danse et la parfaicte méthode de l’enseigner tant aux cavaliers qu’aux dames was not motivated solely by artistic concerns.
Some of the introductory materials—a letter to the author’s patron the Duke of Buckingham (George Villiers, 1592–1628), three curiously attributed dedicatory poems, and a mythologically inspired frontispiece (above)—appear to contain coded messages referring to the political and amatory activities of Buckingham and others; they may even have been tools of espionage.
This according to “Deciphering de Lauze” by Martha Schwieters (Proceedings: Society of Dance History Scholars [Riverside: Society of Dance History Scholars, 1999] pp. 69–78).
For another early dance treatise, see Basse danse with attitude.