Direnni Hegemony

The Direnni Hegemony was a name commonly given to High Rock by roughly the middle of the First Era, due to the massive significance of the Direnni Bloodline. The Direnni Bloodline was a line of Aldmer, based out of Direnni Tower, (Renamed from its original name, the Adamantine Tower)

They fought against the influence of the Alessian Empire fighting numerous battles, and eventually helping to lead to their defeat. They also then started to expand their territory to the north and south of High Rock, and made significant gains in Skyrim. At the peak of their power and influence, they controlled over a quarter of Tamriel.

Eventually, they began to lose their influence, until eventually they only controlled the Direnni Tower. It is laregely due to the power vacuum caused by the Direnni decline that caused the fragmentation of High Rock into various walled city-states.