509 BC

The year 509 BC was a year of the pre-Julian Roman calendar. In the Roman Republic it was known as the Year of the Consulship of Brutus and Collatinus (or, less frequently, year 245 Ab urbe condita). The denomination 509 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.

Events

By place

Roman Republic

According to the traditional account:

• The
  Roman monarchy is overthrown, and the Republican
  period begins (traditional date).
• The first pair of Roman consuls are elected.
• The Tarquinian conspiracy is formed yet discovered, and the conspirators are executed.
• Forces of
  Publius Valerius Publicola celebrates the first republican triumph on March 1
  .
• ides
  of September.
• Carthage signs a treaty with Rome, delineating their respective spheres.^[1]

Deaths

• Roman republic
  (traditional date)
• Tiberius Junius Brutus, brothers (and sons of the consul Lucius Junius Brutus) together with their two uncles the Vitellii and three brothers Aquillii, all executed following the discovery of the Tarquinian conspiracy
• Aruns, son of the last Roman king Lucius Tarquinius Superbus
• consul suffectus

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