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Capital city
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Flag of Collinebourg
Coat of arms of Collinebourg
Coat of arms
Joanus’ City
Adeste fideles
Come all ye faithful
Nation Yonderre
Founded byJoanus de Martigueux
 • TypeCollinebourg City Council
 • Grand Duke of YonderreAuguste IV de Somua
 • Count of CollinebourgJoanus XII, Count of Collinebourg
 • Castellan-Steward of CollinebourgGuillaume Archibault (UY)
 • Total2,522 km2 (974 sq mi)
 • Total8,230,000
 • Density3,263.283/km2 (8,451.86/sq mi)

Collinebourg is the capital and largest city of the Serene Grand Duchy Yonderre. Collinebourg stands on the Peritonne river with a population of 8.200.000 in its metropolitan area, making up just under 9% of Yonderre's total population. Previously independent cities like Nouvelle-Estia and Nymia have been incorporated into Collinebourg due to urban sprawl.

Collinebourg was founded in 1464 by the Estian Count (later Grand Count of Yonderre) Joanus de Martigueux when he built his castle on a hilltop overlooking a narrow stretch of the Peritonne river at the height of the Conquest of Joanusterra. Local Gothic settlements had existed on and around the site since neolithic times. Settlers soon came from the Holy Levantine Empire and Collinebourg saw rapid expansion even in Joanus' own lifetime. Collinebourg was made capital of the new marcher realm Jouanusterra in the Treaty for the guarantee of Joanus' Land signed with the Holy Levantine Empire in 1494. Collinebourg remained an important trade city for land-based trade into the Age of Enlightenment due to its strategic location on the crossroads of Catholic Levantia and Ultmar. The Great Fire of Collinebourg raged for four days in 1728 and ravaged much of the medieval city, and although it left around a quarter of Collinebourgers homeless it also cleared the path for modernization and urbanization previously thought impossible in the inner city. Further developments during the Yonderian Golden Age brought a Neoclassical look to Collinebourg's architecture.

Collinebourg remains a cultural and economic powerhouse in the Vandarch region. With a number of bridges connecting the various districts, the cityscape is characterised by parks, promenades, and waterfronts. Collinebourg is home to Guillaumebourg which houses the Yonderian Parliament. As the historic core of the modern state Yonderre, Collinebourg serves as the home of numerous Yonderian artists, scientists, and sports figures due to the presence of its various museums, academic and political institutions, and theaters. The city is home to Collinebourg University, the oldest and largest university in Yonderre. Collinebourg is an international tourism destination, being the second most popular in Yonderre after Gabion. Collinebourg is also home to the Ligue Yonderre football clubs Artillerie FC and Collinebourg Chevaliers.


The name of Collinebourg comes from the Collinebourg Castle. It is a combination of the Burgoignesc words colline meaning "hill" or "mount" and bourg meaning "castle". Historic Gothic names for Collinebourg have been Gothizied spellings of the Burgoignesc name including Kohlangburg and Kölingburg as well as the directly translated Höhenburg, "Hillcastle" or "Castle on the hill".

Collinebourg has sometimes historically (if incorrectly) been referred to as "Collinsburg" or "Collin's Burg" in Ænglish.


Early history

Collinebourg was founded in the mid-1460s during the Conquest of Joanusterra, centred around Collinebourg Castle which was under construction at the time. The settlement was made atop a tall hill overlooking a particularly narrow part of the Peritonne River that stretches from the Vollardic Mountains to the Vandarch Sea. Although the lands around Collinebourg were already settled by Gothic peasantry, the first settlers to move to Collinebourg were Derians, chiefly Bergendii people. These Bergendii settlers established the neighbourhood Bourgville immediately outside Collinebourg Castle itself. Crispinian de Burbindær became the first Castellan-Steward of Collinebourg in 1470, a form of supreme bailif to rule the city in the absense of Joanus de Martigueux. By Papal Bull, the University of Collinebourg was founded in 1479, also in Bourgville, which drew in more settlers. Bourgville became enclosed within an outer stone wall in the 1490s, a ring wall as part of the Collinebourg Castle. Collinebourg at this time had already expanded beyond the confines of the hill on which the castle stood and was now covering both sides of the Peritonne River thanks to the emergence of ferrymen operating boats on the river. The Urcean lord Niall Ermarco wrote of the importance of Collinebourg as a crossroads of commerce in 1502: "It lies between the Angles, the Derians, the Urceans and the Goths, and it belongs to the King of the Goths".[1]


Collinebourg in the sixteenth century

Great Fire and Golden Age



The University of Collinebourg is Yonderre's oldest university founded in 1479. The Academic Ranking of World Universities placed it 30th in the world in 2026. The city is also home to Collinebourg Business School, Metropolitan University College, University College Capital, Technical University of Yonderre, Yonderre Business Academy, IT University of Collinebourg and the Collinebourg campus of Gabion University. The Yonderian Academy of Fine Arts has provided education in the arts for more than 300 years. It includes the historic School of Visual Arts, and has in later years come to include a School of Architecture, a School of Design and a School of Conservation.


Population by ethnic background in 2025

  Yonderian (82.2%)
  Other Levantine (8.9%)
  Sarpic (4.2%)
  Cronan (2.5%)
  Others (2.2%)


As of 2025, Collinebourg is home to 8,230,000, making it the most populous city in Yonderre ahead of Gabion with 7,842,000. Collinebourg, like much of Yonderre, experienced a population boom in the 1940s and 50s in the aftermath of the Second Great War. Defined as having at least one Yonderian parent, 82.2% of Collinebourgers are ethnic Yonderians, 8.9% "Other Levantine", 4.2% Sarpic, 2.5% Cronan and 2.2% from elsewhere in the world. The largest single group of immigrants or descendants of recent immigrants in Collinebourg are Bergendii people from Burgundie, making up 2.6% of the total population of Collinebourg.


As in the rest of Yonderre, the Burgoignesc and Gothic languages are used almost interchangably throughout Collinebourg. Signage including road signs, service signs and information signs are all required to be bilingual by law. Toponomy like place names and street names are also bilingual such as the Place Joanus (Burgoignesc) and Joanusplatz (Gothic) or the Rue de Caryale (Burgoignesc) and de Caryale-Straße (Gothic).

Compared to the approximate 40-60% split of Burgoignesc and Gothic as native languages among Yonderians respectively, Collinebourg has a higher number of native Burgoignesc speakers at around 50-55% depending on census. The number also depends on the individual munincipalities; while Centre-Collinebourg more or less matches the 40-60% split, Bourgville has almost 70% native Burgoignesc speakers and Nymia approximately 75% native Gothic speakers.



Quality of living



Government/Governing body

City districts



Night panorama of central Collinebourg

Sister cities


  1. Laurent, S.: Collinebourg - a history, Volinghaus Publishing, pg. 6-13. 2009.