The authoritative book on the Rome is The History of the Decline and
Fall of the Roman Empire by Edward Gibbons.
In it Gibbons mentions the Five Good Emperors: Nerva, Trajan, Hadrian,
Antoninus Pius, and Marcus Aurelius. (96 to 180 AD)
It is preposterous that Trajan and Hadrian should be on this list.
Why? Because one of the attributes Gibbons claims they all had was religious
But Marcus Aurelius was a true Philosopher King.
His Stoic writings were never meant by him to be published.
Yet they may be the greatest legacy of the Roman Empire.