Kruszwica is a place associated with a centuries-old historical tradition, considered one of the oldest in Poland, and therefore, from the earliest times, in the consciousness of Poles, this place was associated with the genesis of the Piast state. The special natural and cultural conditions of medieval Kruszwica and the region on Gopło caused that studies on the history of this center occupy an important position in the historiography of Poland. Kruszwica has permanently inscribed itself in Polish dynastic history, the construction of the Piast state and its structures. During over 65 years of research, primarily archaeological, a collection of unique sources of material culture was obtained. Their development allowed for the verification of many previous findings regarding the beginnings of the state, the formation of church, administrative and economic structures and expanded the existing historical knowledge on the formation of the spiritual and material foundations of the institution of power and cult.