noun
Peloponnesian War
Refers to the ancient Greek war between Athens and Sparta (431–404 BC). Used as a historical proper noun.
ペロポネソス戦争は紀元前431年に始まった。
The Peloponnesian War began in 431 BC.
From Greek 'Peloponnesos' (Peloponnese) + 戦争 (war). The term is a direct translation of the historical event name.