Suspicious and fearful of Athenian power and wealth, the Spartans were not happy with the thirty-year peace they had agreed to. The Athenians themselves had become chauvinistic and power hungry, and seemed ready to begin to reassert their power on the mainland of Greece. In 431, spurred on by a relatively trivial event in a distant part of the Greek mainland, Sparta and Athens fell into another war which is simply called, The Peloponnesian War. The Peloponnesian War started when the Spartans and their allies invaded Attica in the spring of 431 BCE.
Sparta was an ancient city in Greece, the capital of Laconia and the most powerful state of the Peloponnese. Sparta was seen to have developed a system of