Military action
The year the war between Eclus and Astra started. They were fighting over possession of the volcano on the Eastern Peak.
It took two years of war, in which part of Astra was severed from the rest, because Eclus took advantage of the mountain range that seperates Astra from the other side in the East. The part of the lands got independent and developed into what today is the country Tegria. Astra nevertheless was winning the war, outnumbering Eclus' forces by far. In the end, the elves from Driylia threatened Astra to get involved if they don't find a solution other than slaying the Dragonborns. They agreed on Eclus getting the volcano and Astra getting a share of the riches that they get from there.