He was the brother of Menelaus, Helen's husband.
The oaths of Tyndareus which bound the Suitors to follow him.
The navy that was built from the wealth of his ancestor, Pelops.
His personal magnitude and commanding presence.
Thebes and Megara
Corinth and Corcyra
Attica and Hellas
Athens and Sparta
Corcyra and Athens vs Corinth and Sparta
Corcyra and Sparta vs Corinth and Athens
Athens and Sparta vs Corcyra and Corinth
Athens and Thebes vs Persia and Sparta
Athens was a much larger city than the other allied cities.
Athenian hoplites were better armed and trained.
Athens imposed monetary contributions rather than demanding ships from its allies.
Advanced Athenian science led to the development of better military technologies.
Because their Corinthian allies appealed for help.
Because the Athenians had invaded the Peloponnese.
Because they feared the Athenians' growing power.
Because the Spartan king Archidamus demanded it.
The Twenty Years' Peace
The Fifty Years' Peace
The Ten Years' Peace
The Thirty Years' Peace
The Spartans rejected Athenian aid in suppressing the Helot revolt.
The Spartans invaded Attica in support of Carian rebels.
The Spartans demanded that Athens tear down the Long Walls.
The Spartans were building a navy to contest Athenian power.