We use many concepts and metaphors to facilitate understanding and explanation of the past In historical narrative. One of the ideas rooted in Polish historiography is the Piast idea, which is a kind of narrative metaphor. It functions as an element of a broader narrative that praises nativeness - starting with the Slavic idea, through the Piast idea, ending with Polishness. Building national identity required and requires appropriate treatment of the founders of the state - the first Piasts, those domini naturales. The concept of Piast Poland began to play an important role in the work of historians in the 19th century, although it had already existed in historical literature earlier. Historians such as O. Balzer, Z. Wojciechowski and W. Semkowicz played an important role in its construction. Building national identity based on the Piast idea took the form of the official historical policy of the Polish state after 1945. Silesia, which was then annexed to Poland.