Lucius Annaeus Seneca the Younger (4-65 CE) was born in the Roman Spanish city of Cordoba. Southern Spain was one of the most Romanised parts of the Roman Empire outside of Italy, so it is not surprising that Seneca made his way to Rome where he became a writer and, it seems, a money lender. He was also tutor to and then adviser to the Emperor Nero. He had previously been in conflict with the Emperor Claudius, for unknown reasons, and was exiled to Corsica for a while as a consequence.

Seneca’s writing career covered philosophical essays, tragedies, and letters which amounted to an exploration of his philosophical interests. He followed the Stoic school of philosophy, which goes back to the Greek philosopher Zeno of Citium (334-226BCE), and was influential on the Roman upper classes. So much so that the Emperor Marcus Aurelius (121-180CE) wrote his Meditations with regard to Stoic thinking on character and ways of living. It was written in Greek, indicating how far Roman thought on ethics, politics, and other topics was continuous with, or at least engaged with, ancient Greek thought.

Seneca’s relations with Nero turned out to be even more destructive than those with Claudius. Seneca tried to educate and advise Nero to be honest, just, and restrained in the use of power. However, Nero turned out to be one of the most infamously cruel, paranoiac, and violent Emperors. These negative tendencies were turned on Seneca, so that even after Seneca had retired to the countryside to avoid the bad atmosphere around Nero, he was forced to commit suicide on suspicion of complicity with a conspiracy to assassinate Nero. (Nero himself was overthrown and pressured to commit suicide three years later.) Suicide was a relatively honourable form of death for Romans, and it was a privilege to be allowed to commit suicide rather than face execution, nevertheless Seneca and Nero can be said to have both met sorry ends as a result of political turmoil initiated by Nero.

Nero’s behaviour was really the direct opposite of that recommended to rulers by Seneca’s essays on anger and on mercy, and was a painful failure for Seneca who had tried to educate him from childhood for a moderate self-restrained use of power. Seneca’s approach to politics is to advise an absolute ruler in the use of power, so he might seem a bit paradoxical as part of a series on liberty. However, Seneca was considered as a major supporter of republics, of government based on individual liberty in the early modern period, so that Thomas Hobbes, the authoritarian-minded philosopher and political thinker, considered his thought a danger to sovereign state power.

Seneca’s thought certainly did mark the death of the Roman Republic, which was essentially abolished in substance (after a historical phase of hollowing out) by Julius Caesar in his period of absolute power from 49BCE until his assassination in 44BCE. The failure of the assassins to restore the republic led to the absolute power of Augustus and the inauguration of the autocratic emperor system.

Seneca refers unfavourably to those who use the Greek idea of ‘parrhesia’, that is free and critical public speaking, to excess, going against what had been taken as central to the liberty of citizens. The reason Seneca can be placed in the liberty tradition is that even when criticising excess in free speech, he praises a Macedonian-Greek king on the receiving end for the restraint of his reaction. Living in an age of absolute rulers, Seneca’s main concern is that they rule as the foundation of individual rights rather than as a source of arbitrary power over citizens.

The essays on mercy and anger bring together the fields of personal virtue and the best ways of governing. Virtue for Seneca, as was normal for ancient thinkers, was deeply embedded in ideas of self-restraint and moderation. From this point of view anger damages the angry person, as an example of self-harming extreme behaviour. Anger is a negative painful state of mind and to act under its influence leads to great harm.

Seneca is not simply saying that a ruler should follow general moral virtue in the manner of ruling. He places a particular responsibility on the ruler to resist anger and show mercy. The individual may harbour resentment against some enemy who caused harm, but the ruler must avoid such resentment. The ruler who publishes and executes all those regarded with suspicion as present or future enemies harms the state and the public good. Harsh treatment of individuals by rulers leads to those individuals becoming angry with the ruler so conspiring against that person. Executions will only stimulate further rebellion by those who were closest to the executed and leads to an increasingly violent period of rule. All the violence and revenge has negative consequences for the public good as well as for those persecuted.

The ruler should regard all individuals as part of the state, which he should be trying to manage responsibly. The state is harmed if any individual within the state is harmed, as the state exists to promote the public good. The ruler who cannot restrain desires for cruelty and who ignores the rights of individuals is suffering from a self-harming weakness of character and is likely to suffer violent revenge. Seneca mentions the third Roman Emperor, Caligula, in this context, who was assassinated in 41CE, four years after succeeding Tiberius.

The best thing the ruler can do is show mercy. Those who receive mercy, even after plotting assassination, are likely to start supporting the ruler, and even work for the ruler. It is better to forgive and try to integrate a conspirator than kill the conspirator so that others will wish to avenge that murder. The ruler should obey laws as much as ordinary citizens, and should be mild in applying laws. Everyone is guilty of some fault, of some minor breach of law, at some time, so that punishing all wrong-doers will lead to the destruction of a society, as nearly all inhabitants of the territory of the state disappear.

While Seneca assumes that political power rests with one person, he argues that the continuing exercise of the power rests both on reliable justice with regard to the execution of laws and restraint from the most extreme or obsessive punishment. The powers of the state are understood as different from those of an individual, and as such must be much more limited in use than the power of citizens. The rights and welfare of citizens depend on a ruler who follows law and assumes less power than individuals, which makes a worthy contribution to thought about liberty.