Letter listing for 1770–1779
- Marie Jayet [née Silvieux] to Voltaire [François Marie Arouet], 6 January 1778
- Corilla Olimpica [Maria Maddelena Morelli Fernandez] to Giovanni Cristofano Amaduzzi, 6 January 1778
- Marie Anne de Vichy-Chamrond, marquise Du Deffand [née de Vichy] to Horace Walpole, 4th earl of Orford, 6 January 1778
- Voltaire [François Marie Arouet] to Frederick II, king of Prussia [the Great], 6 January 1778
- Louis XVI, king of France to Charles III, king of Spain, 8 January 1778
- James Boswell to Doctor Samuel Johnson, 8 January 1778
- Jean Jacques Rousseau to Mme Marie Antoinette Duchesne [née Cailleau], 8 January 1778
- Pierre Augustin Caron de Beaumarchais to Jean Frédéric Phélypeaux, comte de Maurepas, 9 January 1778
- Marie Louise Denis [née Mignot] and Voltaire [François Marie Arouet] to Alexandre Marie François de Paule de Dompierre d’Hornoy, 9 January 1778
- Marie Louise Denis [née Mignot] to François Tronchin, 9 January 1778
- Jean Jacques Rousseau to Élisabeth Jeanne Pierrette de Corancez [née Romilly], 9 January 1778
- Jean Jacques Rousseau to Élisabeth Jeanne Pierrette de Corancez [née Romilly], 9 January 1778
- Richard Brinsley Sheridan to David Garrick, 10 January 1778
- Voltaire [François Marie Arouet] to Jean Baptiste Isoard de Lisle, 10 January 1778
- Henri Lambert d’Herbigny, marquis de Thibouville to Comédie-française, 11 January 1778
