How these dates were made
Why this bar's edges are floors, not a founding and a fall.
The atlas draws the world at 2 moments in time, not continuously. This bar runs from the first snapshot in which Buwayhid Emirates appears to the last, so both edges are floors — the earliest and latest years it is attested, not a founding and a dissolution.
Elsewhere in Middle East 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.
Landmark · Middle East
Rock-Hewn Churches of Lalibela
1181 CE – still standingPolity · Middle East
Seljuk Empire
1037 CE – 1194 CETrade route · Middle East
Mediterranean Southern Route
331 BCE – 1500 CEConflict · Middle East
The Crusades
1096 CE – 1291 CELandmark · Middle East
Hormuz
1100 CE – 1600 CEPolity · Middle East
Shirvan
Founded 400 CE · attested to 1100 CETrade route · Middle East
Maritime Silk Road – Red Sea Branch
200 BCE – 1500 CEConflict · Middle East
Seljuk Turkish Conquests
1037 CE – 1092 CEDated moments inside this span
Events the timeline places between 1000 CE and 1200 CE.
And in the rest of the world
Records running through the same years, on the other side of the map.
Image credits3 pictures from Wikimedia Commons
- Rock-Hewn Churches, LalibelaSailko · CC BY 3.0
- Crusadesanonymus · Public domain
- Shirvan[1], The age of expansion : Europe and the world, 1559-1660, by Trevor-Roper, H. R. (Hugh… · Public domain