Free City of Lilienburg
Freistadt Lilienburg (Lilienburger Herusian)

Flag of
Motto: "Fraternity Above All"
and largest city
Official languagesLilienburger Herusian
GovernmentUnitary parliamentary republic with elements of syndicalism and direct democracy
• Mayor
Helena Weissmann
• Chancellor
Hermann Thaler
• Total
3,546 km2 (1,369 sq mi)
• 2017 census
• Density
171.23/km2 (443.5/sq mi)
GDP (PPP)2017 estimate
• Total
$24.405 billion
• Per capita
Gini (2017)19.9
HDI (2017)0.897
very high
CurrencyLilienburger mark
Calling code+328

Lilienburg, officially the Free City of Lilienburg (Lilienburger Herusian: Freistadt Lilienburg), is a city-state located within Erdara, bordering Tudonia to the south, Mascylla to the east, Hytekia to the west and Lake Sigismund to the north-east. The nation is the smallest in Erdara, with an area of 3,546 square kilometers, consisting of the namesake city of Lilienburg, where the overwhelming majority of the nation's 607,183 residents live, and the surrounding countryside.

The city's existence is first recorded in the 11th century as a small market town and fishing village. In the 12th century, however, it became the location of a significant monastery during the 12th century and the town started to grow around the monastery. The monastery gained a reputation for scholastic work as time went on, and in 1415 the University of Lilienburg was opened by the monastic order to educate monks and civil servants, largely focusing on classics and theology. The university, being the first in Erdara, would eventually eclipse the town's other industries and become the town's raison d'être as scholars, monks and priests flocked to the town.

During the 16th century the university town would assert itself as an independent city; the city's council, consisting of property owners and university graduates, would become the sole authority over the city and it declared itself the Free City of Lilienburg.