Nuvallen

Nuvallen is the capital and most populous city of the Simulami empire, with an estimated population of 100 residents. The city stands along the Nordulac marshes in the Convellirae district. It was founded by the Imperares Cadexii and Zeno in ASC 1633, to serve as the new national capital and seat of the royal administration. Since its founding, it was has developed into the cultural, economic, and political epicentre of the nation, as well as the largest city in Nieden

History
The region the city sits had previously been inhabited by Niedene for thousands of years. A city named Septrion was established in the area in ASC 208 and became one of the most prominent cities in the Soleannan Empire for hundreds of years. However, it began to gradually decline in the early 900s ASC as the empire declined due to economic recession, corruption, infighting, and migrating Niedene tribes. As the empire was occupied with other matters, and Septrion was located close to the outer edges of the empire, the city found itself exposed. This culminated in Septrion being sacked in ASC 915 by migrating Niedene tribes from the northwest of Nieden. The tribes once again attacked the city in ASC 926, selling many of its inhabitants into slavery, and this time burning large areas of the city to the ground. Subsequently, the city declined in population drastically over the next few decades and was largely an uninhabited ruin by the time the Soleannen Empire fell in ASC 971 with the destruction of Soleanna in a cataclysmic event.

For the next few centuries, the ruins of the city would largely be abandoned, and the lands surrounding them would be under the control of numerous feuding petty Niedene kingdoms. Parts of the ruined city. It was conquered by the Escharian Empire in ASC 1573 under the leadership of Severie I. In ASC 1574, a new settlement was founded by Escharii settlers called Mondstadt, though not directly on the site of the abandoned city of Septrion, but rather slightly further to the north where the town of Aquize is located today. There was also a small village called Fantasia that emerged around this time, a few hundred meters east of the ruined city. The still-existing ruins were largely dismantled so that they could be used as building materials for the adjacent towns, since it was easier to dismantle the ruins than it was to quarry fresh stone. The last relatively intact structure of Septrion were the ruins of the Gildural castle: they were partially repaired before being once again abandoned due to the expansion of the empire's borders westward, making it unnecessary for a castle to be maintained so far in-land.

The adjacent towns would experience prosperity during the period known as Pax Soleanna. However, things took a turn for the worst in ASC 1593 when the Ascension was ordered by Severie I after the Silver Coalition and Bardonia, long-time allies of the Escharian Empire, turned against it. This signified the beginning of chaos in the region and with the Ascension, the region was severely depopulated of Niedene and mostly occupied by the spirits. There were smaller rump successor state kingdoms that arose as a result of the Ascension, such as the Kingdom of Argentor, which acquired control of the ruins of Spetrion, whereas Mondstadt and Fatasia came under the control of the adjacent Kingdom of Locetia. Nevertheless, severe infighting, recession, and constant raids by Floramii and Krobuni tribes caused both of these kingdoms to fall only 2 years later in ASC 1595, with both Mondstadt and Fatasia being totally abandoned by 1596.

The large-scale depopulation of the continent provided an opportunity for the small isolated pockets of Floramii and Krobuni populations in northeast Nieden to spread outward. By ASC 1598, the Krobuni had settled in the area of the Septrion ruins. A few years later in ASC 1605, the rapidly expanding Floramian kingdom annexed the area, and the Aquizan people were permitted to settle in the formerly abandoned town of Mondstadt in order to establish greater control of the region. Although this was hampered due to constant raids by the Soleannen spirits. With the rapidly growing Soleannen and Krobuni-dominated Order Müvielle led by ZenoHUN being established in ASC 1609, the area was transferred to them under the agreement of being a vassal to Floramia. Later, it was revised to the status of a protectorate, and less than a year later, Müvielle declared full independence of Floramia. Consequently, tensions between the two erupted. Since the site of the ruin was near the border between the two states, Müvielle built an improvised wooden fortress and watchtowers in order to protect the area from possible Floramii attacks and raids.