Shirakawa-Saramosir

Shirakawa-Saramosir, also known as the Shun Commonwealth (春連邦 Shun Renpō) or the Great Shun State (大春国 Daishungoku), was a country and bi- of Shirakawa and Saramosir that preceeded the formal unification of Chisei. Established under the Treaty of Sumura in 1674, the kingdom was initially a loose political alliance ruled by a consisting of Grand Queen Shun Kansō and her husband, Kunneshain, the Nashka-pa of Saramosir. The two states were brought closer in 1711 after the succession of Grand King Shun Keizo united the two crowns under the Shun dynasty.

Both states retained extensive autonomy for much of the union's existence, despite the merger of the dynasties, with the monarch ruling as both Daiō and Nashka-pa simultaneously and maintaining seperate capitals and courts. The decentralised regime encouraged the development of extensive civil services in both countries, which exercised significant control over domestic matters and even sometimes foreign policy, while the administrative center of the Royal Court shifted between the two capitals depending on the whims and needs of the monarchy.

An enduring feature of the Commonwealth was the incomplete union of its colonial possessions, which were governed under charters issued by their respective national governments, not by the Crown.

The Shiro-Saramosiri period came to an end with the Shokyō reforms beginning in 1771, which abolished the loose political union and centralised administrative power under the Royal Court, now permanently located in Eito.