August 27

ante diem VI Kalendas SEPT
Volturnalia
Cult of Volturnus, river god of the Tiber, and father of the fountain god Juturna. He was associated with the southeast wind Eurus. Volturnus may have been an Etruscan import. Volturnus had his own flamen.
See Scullard's Festivals and Ceremonies of the Roman Republic.

Greeks and Persians - Battle at Plataea 479 B.C.

Lunar eclipse in Sicily 413 B.C.

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