Which Happened First?

First Peloponnesian War

First Peloponnesian War — Image: Map_athenian_empire_431_BC-en.svg: *Map_athenian_empire_431_BC-fr.svg: Marsyas derivative work: Once in a Blue Moolk:Once in a Blue Moon|talk) derivative work: Γιάννης Α. ✆|☑ · CC BY-SA 3.0 · source

The First Peloponnesian War was fought between Spartans as the leaders of the Peloponnesian League and Sparta's other allies, most notably Thebes, and the Delian League led by Athenians with support from Argos. This war consisted of a series of conflicts and minor wars, such as the Second Sacred War.

Summary from Wikipedia (CC BY-SA 4.0) · Dates from Wikidata (CC0)

Which happened first?

First Peloponnesian War began 19 years after Battle of Plataea
First Peloponnesian War began 19 years after Battle of Mycale
First Peloponnesian War began 20 years after Second Persian invasion of Greece
First Peloponnesian War began 20 years after Battle of Himera
First Peloponnesian War began 28 years before Battle of Potidaea

Timeline

Battle of Himera480 BC
Second Persian invasion of Greece480–479 BC
Battle of Mycale479 BC
Battle of PlataeaAugust 27, 479 BC
First Peloponnesian War (this page)460–445 BC
Battle of Potidaea432 BC

Related

Play a round with Wars & Conflicts · Ancient