Year 406 BC was a year of the pre-Julian Roman calendar.
Events
By place
Greece
Callicratidas becomes the navarch of the Spartan fleet, replacing Lysander. Athens wins the Battle of Arginusae. Returning to Athens after the battle, Theramenes leads Athenian anger against the eight generals who were in the battle. They did not get survivors from the broken ships after the battle. The Athenian generals are put to death. Sparta asks for peace. Cleophon says no.
Roman Republic
The Roman forces begin a decade-long siege against Veii.
Carthage
The Carthaginians again invade Sicily and attack Agrigentum. Plague breaks out in their camp and Hannibal Mago dies.
Deaths
Euripides, Athenian playwright (b. c. 480 BC) Hannibal Mago, Carthaginian general Sophocles, Athenian dramatist and politician (b. c. 495 BC)