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User:PANONIAN, derivative work: User:Ceha · CC BY-SA 4.0
Polity Europe

Chelmia

Attested 900 CE

Medieval Balkan principality

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Zachlumia on Wikipedia.

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How these dates were made

Why this bar's edges are floors, not a founding and a fall.

The atlas draws the world at one moment in time, not continuously. This bar runs from the first snapshot in which Chelmia appears to the last, so both edges are floors — the earliest and latest years it is attested, not a founding and a dissolution.

900 CE

Elsewhere in Europe at the time

Records whose own span overlaps this one, found by the same test the canvas draws with. The bar under each card is where it sits inside this one.

See the whole view

Landmark · Europe

Plitvice Lakes

3000 BCE – still standing

Polity · Europe

Sweden

Founded 900 CE · attested to 2026 CE

Conflict · Europe

Byzantine–Arab Wars

629 CE – 1180 CE

Trade route · Europe

Venice–Constantinople Route

800 CE – 1600 CE

Landmark · Europe

Giant's Causeway

3000 BCE – still standing

Polity · Europe

Denmark

Founded 800 CE · attested to 2026 CE

Conflict · Europe

Viking Invasions

793 CE – 1066 CE

Trade route · Europe

Varangian Trade Route

800 CE – 1100 CE

Dated moments inside this span

Events the timeline places between 900 CE and 900 CE.

900 CE Toltec Wars 900 CE Zanzibar 900 CE Mombasa 900 CE Kilwa Kisiwani 900 CE Sofala 900 CE Mogadishu

And in the rest of the world

Records running through the same years, on the other side of the map.

Grand Canyon Landmark · Americas 3000 BCE – still standing Hindu kingdoms Polity · South Asia 500 BCE – 1715 CE Mesoamerican Trade Network Trade route · Americas 1200 BCE – 1521 CE Maya City-State Wars Conflict · Americas 400 BCE – 900 CE Al-Razi Figure · Rayy / Baghdad / Persia 854 CE – 925 CE Great Barrier Reef Landmark · Oceania 3000 BCE – still standing
Image credits7 pictures from Wikimedia Commons