Keisi (Senrian: in Kokumon 께씨, in Gyoumon 京師; literally "capital"), officially the Keisi Metropolis and archaically Heikyou, is the capital of Senria. With a population of 20.8 million as of 2018, it is one of the largest cities proper in Kylaris by population; the Greater Keisi metropolitan area, with more than 62 million inhabitants, is the most populous metropolitan area in Kylaris. It is located on the located on the island of Kousuu, where the Yonesiro, Kinyou, and Idemori rivers flow into the Nangyoku Inland Sea.
Keisi is first mentioned as Heikyou in a Xiaodongese chronicle dating to 372, listing it as the seat of the Senrian monarchy... [history]
[modern importance - economics, culture, tourism, education, whatnot]