Archon War

The Archon War is a collection of various power struggles between archons that began several thousand years ago, when seven divine seats in Celestia opened up.
Different regions settled their power struggles at different times, but as a whole, the war drew to a close 2,000 years ago. At the conclusion of the war, the Seven Archons determined the seven nations of Teyvat, as well as the seven elements.
However, not all archons participated in the war with the intent of taking a divine seat; some wanted to defend their territory, while others didn't even want to fight and tried to save as many people as possible from the destruction of the war.