Kishnari

The Kishnari were an ancient culture who created a vast civilisation, which prospered roughly between the Fourth century and the Ninth century. They were largely based in the lands now known as Hirokir, but spread far into the Shattered Sea.
The Kishnari established many of the present-day traditions of Hirokir, and their religion was an early form of the modern Tenets of Hir. Their culture also influenced the Kanemoku islanders of the Shattered Sea.
During the later period of their Empire, the Kishnari came into conflict with the Tuquessi Empire of the Shattered Sea. 
At its peak, Kishnari territory included the southern coast of Hirokir, the island of Scathyro, and many of the surrounding smaller islands. Their capital was originally located at Zul'Garab, but they later moved it to Scathia.
The Kishnari Empire was ruled by a singular Emperor, who held absolute power.
The Kishnari Empire collapsed after their hubris resulted in the creation of the Demonlord Rukdai on Scathyro, rendering half their empire uninhabitable.