405 BC

Millennium:	1st millennium BC
Centuries:	6th century BC – 5th century BC – 4th century BC
Decades:	430s BC 420s BC 410s BC – 400s BC – 390s BC 380s BC 370s BC
Years:	408 BC 407 BC 406 BC – 405 BC – 404 BC 403 BC 402 BC

Year 405 BC was a year of the pre-Julian Roman calendar.

Events change

The Athenian fleet follows the Spartan admiral, Lysander, to the Hellespont. The Athenian fleet is destroyed in the Battle of Aegospotami.
The Spartan king Pausanias lays siege to Athens. Lysander's fleet blockades Piraeus. This starves Athens.
Theramenes tries to negotiate with Lysander. He is away for three months.

Dionysius the Elder rises to power as the tyrant of Syracuse. He makes peace with the Carthaginian general. Carthage is in control of most of Sicily.
Dionysius the Elder expands his power. He builds a wall around Syracuse. The Greek citizens of Naxos, Catana, and Leontini are removed from their cities. Many of them are made slaves.

Aristophanes' play The Frogs is performed.
Euripides' The Bacchae and Iphigeneia at Aulis are performed at the Dionysia and win first prize.

The Erechtheum, which includes The Porch of Maidens (Caryatid Porch), is completed in the Ionian style on the Acropolis in Athens after 16 years of building.

Philolaus, Greek mathematician and philosopher (approximate date) (b. c. 480 BC)