1. Language and life in letters; 2. A Roman conversation? Code-switching in diachronic context; 3. Republic of letters: the politics of Cicero's Epistolary Code-Switching; 4. Imperial relations: Greek and the lingua Romana of Fronto and friends; 5. The language of letters and beyond: Greek in Suetonius' biographies; 6. Weaving together the threads: epistolary connections.