Older Than deck / Events and discoveries
Battle of Marathon
Sources and checks
Checked 2026-10-21: Researched by Codex (two independent publishers, verbatim quotes); every counted quote re-found on its page by the server check (content-verify); scope and plausibility reviewed by Claude (AI build agent). Quotes are short passages from each source; for dates the quote is the year as printed, read in context.
“490 BCE”World History Encyclopedia: source, retrieved 2026-10-21; quote re-found by the server check
“490 B.C.”HISTORY / A+E Networks: source, retrieved 2026-10-21; server read the page (200) and did not find the quote
“490”Hellenic Ministry of Culture — Directorate of Archaeological Museums: source, retrieved 2026-10-21; quote re-found by the server check
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