In the spring of 1739, Voltaire dedicated La Henriade to Frederick II of Prussia and that summer Frederick penned this foreword. Following their disagreement, however, Voltaire decided to remove the dedication to Frederick and his foreword was not taken to print. It would remain unpublished for seventeen years. In 1746, Marmontel published two fragments of the foreword that would later be corrected and modified several times, including by Voltaire.

This MS played a part in the production of the edition of Mérope published by Prault fils in 1758. The play was first performed at the Comédie-Française on Wednesday 20 February 1743 at the Jeu de Paume de l’Etoile.