Year 403 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Tribunate of Mamercinus, Varus, Potitus, Iullus, Crassus and Fusus (or, less frequently, year 351 Ab urbe condita). The denomination 403 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
HINT:
In this Dossier
403 BC in the context of Thirty Tyrants
The Thirty Tyrants (Ancient Greek: οἱ τριάκοντα τύραννοι, hoi triákonta týrannoi) were an oligarchy that briefly ruled Athens from 404 BCE to 403 BCE. Installed into power by the Spartans after the Athenian surrender in the Peloponnesian War, the Thirty became known for their tyrannical rule, first being called "The Thirty Tyrants" by Polycrates. Although they maintained power for only eight months, their reign resulted in the killing of 5% of the Athenian population, the confiscation of citizens' property, and the exile of other democratic supporters.
View the full Wikipedia page for Thirty Tyrants