The history of Aarhus, one of Denmark's oldest cities, is rooted in the Viking Age. It was a strategically important centre for trade and seafaring, with its development defined by its geographical location and historical events.
The city was founded by Vikings around the year 770 as a small settlement at the mouth of the Aarhus River. Originally, it was called Aros (Arus), which means "river mouth" in Old Danish. This name accurately described its location in a convenient harbour on the bay's shore. The first written mention of Aarhus dates back to 948, when the city became the centre of a diocese and gained its own bishop. Archaeological finds, including a Viking Age shipyard, confirm the importance of the settlement during those times.
A key role in the rise of Aarhus was played by its advantageous geographical position at the intersection of maritime trade routes, which fostered the development of trade and the economy. From the very beginning, the city was a commercial hub, and with the arrival of the railway in the 19th century, it experienced an industrial boom and significant population growth. Its religious significance was also a crucial factor: since the 10th century, Aarhus has been the centre of a bishopric, and the Cathedral, founded in 1201, became the core of the medieval city.
In the Middle Ages, Aarhus actively developed as a Catholic centre. However, its prosperity was interrupted by the plague epidemic in the 14th century, which practically devastated the city. After the Reformation, the centres of public life became the large merchant houses, which hosted warehouses, shops, and the first banks. Despite wars and calamities, the city survived thanks to trade, which remained its main driving force throughout the centuries.