Key point 6 of 8 · Ancient Greece
The Peloponnesian War
The Peloponnesian War (431-404 BCE) pitted Athens, at the head of the Delian League, against Sparta, at the head of the Peloponnesian League, in a conflict that the Athenian historian Thucydides, the principal contemporary source, attributed to the growth of Athenian power and the fear this caused in Sparta and its allies.
Food for thought
Why do you think "The Peloponnesian War" was significant in this period?