According to Seneca a mans reason is his unique good. The difference between man and animals is reason. A mans reason is to determine right from wrong. Animals are animals because they do not have reason.
The Julio-Claudian principate was a period of Roman emperors which started with Augustus then goes down to Tiberius, Caligula, Claudius, and last Nero. Right after the Julio-Claudian principate there was the Flavian Dynasty which had the emperors Vespasian, Titus, and finally, Domitian.