Cheliax Empire (jan 1, 4081 – jan 31, 4722)
Description:
Aspex the Even-Tongued, the Taldan governor of the Cheliax province, knew that Taldor could not fight a massive war on two fronts thousands of miles from each other, and declared independence in 4081 AR.Knowing Taldor would remain focused on its titanic struggle with Qadira, King Aspex of the new nation of Cheliax incorporated the Taldan territories of Galt and Isger by force and Andoran and the winged men of Devil's Perch by diplomacy in what became known as the Even-Tongued Conquest. Due to its size, military power, and boundless ambition, Cheliax would continue to dominate Avistan for the next 600 years.
Source: https://pathfinderwiki.com/wiki/Cheliax#Founding
Added to timeline:
Date:
jan 1, 4081
jan 31, 4722
~ 641 years