Imperium Sanctum Solaris
| Government Type | Feudal Meritocratic Monarchy |
| Ruler | Empress Valentia |
| Capital City | Administrative capital Calithia, Cultural capital Aresol |
| Racial Makeup | Multiracial |
| Religion | Solism |
| Primary Population | 14 |
| Secondary Population | 14 |
| Founded | November 2023 |
| Demonym | {{{demonym}}} |
| Preceded by Hadron, Preadium Natio | Succeeded by [Currently Exists] |
The Imperium Sanctum Solaris, translated to "Holy Solar Empire" and often referred to as the "ISS," is a nation in the northern part of the Ashean continent of Agea. The nation was founded in late 2023 immediately after the end of the Hadron Civil War, as part of a peace deal between the three main belligerents. It was founded as a successor to the Phoenixian Empire, which had fallen in May of the same year. The initial goal of the nation was to unite all sun-worshippers under one banner and recapture the historical phoenixian capital, Aresol, which was considered a holy city in Solism.
Today, the nation is a feudal monarchy consisting of five member kingdoms: Aresol, Zeltbruck, Halcyon, Solhaven, and Hadron, the Imperial Seat of Power.
The nation has two capitals, a cultural capital in Aresol and an administrative capital in Calithia.
