Plutarch
The Moralia (Latin for "Morals", "Customs" or "Mores"; Ancient Greek: Ἠθικά, Ethiká) is a set of essays ascribed to the 1st-century scholar Plutarch of Chaeronea. The eclectic collection contains 78 essays and transcribed speeches. They provide insights into Roman and Greek life, but they also include timeless observations. Many generations of Europeans have read or imitated them, including Michel de Montaigne, Renaissance Humanists and Enlightenment philosophers. (This summary is from Wikipedia.)
These books are free to read. Each is in the public domain in the United States; check your own country's rules before you copy or share one.
