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Flag of Tonga (1862-1866)
Thommy · Public domain
Polity

Tuʻi Tonga Empire

Attested 500 CE – 1815 CE

Empire based in Oceania during around 950s–1865

Wikipedia

The opening of the article, and a way into the rest of it without leaving the site.

Tuʻi Tonga Empire on Wikipedia.

How these dates were made

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

The atlas draws the world at 18 moments in time, not continuously. This bar runs from the first snapshot in which Tuʻi Tonga Empire appears to the last, so both edges are floors — the earliest and latest years it is attested, not a founding and a dissolution.

500 CE 18 snapshots · 400 years unattested at the widest 1815 CE

Running at the same 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.

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Image credits5 pictures from Wikimedia Commons