The bacchanalia, the wild and mystic festivals of the Roman and Greek god Bacchus introduced into Rome from lower Italy by way of Etruria around 200 BCE, were originally held in secret and only attended by women.
The festivals occurred on three days of the year in the grove of Simila near the Aventine Hill, on March 16 and March 17.
Later, admission to the rites was extended to men and celebrations took place five times a month.
According to Livy, the extension happened in an era when the leader of the Bacchus cult was Paculla Annia—though it is now believed that some men had participated before that.
Livy informs us that the rapid spread of the cult, which he claims indulged in all kinds of crimes and political conspiracies at its nocturnal meetings, led in 186 BCE to a decree of the Senate—the so-called Senatus consultum de Bacchanalibus, inscribed on a bronze tablet discovered in 1640 in Apulia in Southern Italy, now at the Kunsthistorisches Museum in Vienna—by which the Bacchanalia were prohibited throughout all Italy except in certain special cases which must be approved specifically by the Senate.
In spite of the severe punishment inflicted on those found in violation of this decree (Livy claims there were more executions than imprisonment), the Bacchanalia would survive in southern Italy long past the repression.
Modern scholars hold Livy's account in doubt and believe that the Senate acted against the Bacchants for one or more of three reasons.
First, because women occupied leadership positions in the cult (contrary to traditional Roman family values).
Second, because slaves and the poor were the cult's members and were planning to overthrow the Roman government.
Or third, according to a theory proposed by Erich Gruen, as a display of the Senate's supreme power to the Italian allies as well as competitors within the Roman political system, such as individual victorious generals whose popularity made them a threat to the senate's collective authority.
