Erechtheion (Temple of Athena Polias) — founded 421 BCE
Erechtheion (Temple of Athena Polias) traces its beginnings to 421 BCE, part of the Ancient World (5th century BCE) — a founding moment that shaped everything that came after.
Context
Ancient World — Empires, philosophers, and the first great cities. That's around 2391 years ago — deep history, roughly 24 centuries in the past. Around the same time, the world was also seeing Plato (428 BCE) and Plato, Greek philosopher (428 BCE).
Why it matters
The founding of Erechtheion (Temple of Athena Polias) in 421 BCE created something durable — a place, institution, or movement that outlasted its era and became a reference point for what came next.
Did you know?
Just 7 years before, Plato (428 BCE) was also making headlines — a reminder how much history can compress into a single decade.
Era
Ancient World
Empires, philosophers, and the first great cities.
Category
Places
Places are the cities, monuments, and landmarks whose stones and streets carry centuries of memory.
Contemporary events
What else was happening in the world around this time.
Sources & further reading7 verified references · tap to open
About this lesson. Overview, context, and “Why it matters” are generated summaries written for study and gameplay. Dates and category placement come from the Timeline question bank[1]; era descriptions are adapted from standard historical periodisation[2]. For primary sources and in-depth reading, use the references below.
- Timeline question bank — © the game's original author, used with permission.
- Era framework based on Wikipedia's Human history overview, CC BY-SA 4.0.
Wikipedia
Community-maintained encyclopedia entry with citations.
Encyclopædia Britannica
Editorially reviewed reference articles.
Library of Congress
Primary sources, photographs, and archival records.
National Archives
Original U.S. government documents and records.
Smithsonian
Museum collections and curator-written explainers.
BBC History
Long-form explainers and documentaries.
History.com
Timelines and topic overviews from HISTORY.
Educational content notice
Lessons are for general historical education, not professional advice. Some entries touch on wars, violence, or other sensitive events — appropriate for ages 9+. External links open in your browser and are not controlled by Timeline.
Quick check
Which of these happened in 421 BCE?
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