Even at the twilight of the Piast dynasty's rule over Cieszyn, the origins of the city were traced back to the meeting of three brothers, the sons of Leszek III. This Polish founding myth of the city was reinforced in 1817 by Alojz Kaufmann, who added the element of the well where the brothers allegedly met. German research on Castle Hill during World War II attributed the rotunda to constructions commissioned by Czech rulers, the Kierownictwo Badań nad Początkami Państwa Polskiego recognized the potential to demonstrate the presence of the Piast dynasty in Cieszyn Silesia as early as the 10th century. Kietlińska's research, conducted as part of the Polish Millennium, pointed to Mieszko I and Bolesław Chrobry as the initiators of fortifications on Castle Hill. He also credited with founding the rotunda. This interpretation resonates in the depiction on the 20 zł banknote, where the inclusion of the St. Nicholas rotunda symbolizes Cieszyn's historical connection to the realm of Chrobry.