Poznań is one of the oldest and historically most significant cities in Poland, often referred to as the cradle of Polish statehood. By the mid-10th century, a fortified settlement already existed on Ostrów Tumski (Cathedral Island) on the Warta River, becoming one of the main residences of the first ruler of Poland, Prince Mieszko I. One of the key dates in the country's history is closely linked to Poznań — the year 966, when Mieszko I accepted Christianity, after which the first cathedral on Polish lands was erected here. The city was first mentioned in the chronicles of the German bishop Thietmar of Merseburg in 1005. Later, the local cathedral became the burial place of the first Polish monarchs, including Mieszko I and his son Bolesław the Brave.
Poznań owes its growth and influence to a fortunate combination of geographical location, commercial activity, and political status. Initially, the city developed on Ostrów Tumski, but by the mid-13th century, when space for expansion became scarce, a new city with a Market Square and a town hall in the centre was founded on the left bank of the Warta by order of Prince Przemysł I. Thanks to its location at the intersection of important trade routes, Poznań quickly turned into a major commercial hub. Although the capital was moved to Kraków in the 11th century, the city did not lose its significance and in 1138 became the capital of the Duchy of Greater Poland, with its "Golden Age" occurring in the 15th–16th centuries, when Poznań's wealth was based on crafts and international trade.
In the Middle Ages, Poznań was not only a commercial but also an important cultural centre. Its economy was based on craft guilds and active trade, and its commercial influence was strengthened by receiving the staple right in 1394 and the right to mint its own currency in 1410. In the 15th and 16th centuries, active stone construction began in the city: residences for the nobility were erected, and the Town Hall was rebuilt in the Renaissance style. During this same period, the Lubrański Academy was founded — the first higher education institution in the city, which secured Poznań's status as an important educational centre.