The Tollund Man (approximate date, based on his being forty years old at the time of death)
390 BC, the cities of Acarnania surrendered to the Spartans under King Agesilaus, and continued to be Spartan allies until joining the Second Athenian Empire in 375 BC.
Amadocus I (died 390 BC), a king of the Odrysae in Thrace in the 5th century BC
The geese in the temple of Juno on the Capitoline Hill were said by Livy to have saved Rome from the Gauls around 390 BC when they were disturbed in a night attack.
Lucius Albinius, a plebeian who was conveying his wife and children in a cart out of the city after the defeat on the Alia in 390 BC, and overtook on the Janiculus the priests and vestals carrying the sacred things.