{"id":3548,"canonical_url":"https://www.kudos365.com/today-in-history/events/431bce-apr-4--3548","name":"c. 431 BCE, April 4","year":-431,"era":"BCE","month":4,"day":4,"url":"https://www.kudos365.com/today-in-history/events/431bce-apr-4--3548","iso-date":"-0431-04-04","precision":"year-month-day","description":"\u003cp\u003eThe Peloponnesian War begins between Athens and Sparta, c. April 4, 431 BCE, marking the start of a decades-long conflict in Ancient Greece. The conflict was triggered by the Theban surprise attack on Plataea, an ally of Athens, in April of that year.\u003c/p\u003e","additional_details":"","photo":"","created_at":"2025-03-31T06:01:05-07:00","updated_at":"2026-05-05T14:50:21-07:00","breadcrumbs":{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"April History","item":"https://www.kudos365.com/today-in-history/april"},{"@type":"ListItem","position":2,"name":"April 4","item":"https://www.kudos365.com/today-in-history/april-4"}]},"schema":{"@context":"https://schema.org","@type":"Thing","@id":"https://www.kudos365.com/today-in-history/events/431bce-apr-4--3548#eventK365","name":"c. 431 BCE, April 4","headline":"The Peloponnesian War begins between Athens and Sparta, c - c. 431 BCE","description":"The Peloponnesian War begins between Athens and Sparta, c. April 4, 431 BCE, marking the start of a decades-long conflict in Ancient Greece. The conflict was...","url":"https://www.kudos365.com/today-in-history/events/431bce-apr-4--3548","additionalType":"HistoricalEvent","inLanguage":"en","datePublished":"2025-03-31T06:01:05-07:00","dateModified":"2026-05-05T14:50:21-07:00","publisher":{"@id":"https://www.kudos365.com/#organizationK365"},"temporalCoverage":"-0431-04-04","isPartOf":[{"@id":"https://www.kudos365.com/#websiteK365"},{"@type":"CollectionPage","@id":"https://www.kudos365.com/today-in-history/april","name":"What Happened in April History"},{"@type":"CollectionPage","@id":"https://www.kudos365.com/today-in-history/april-4#pageK365","name":"What Happened on April 4"}]}}