Moravia reached the peak of its territorial expansion under Svatopluk I (r. 870–894). Lesser Poland, Pannonia, and other regions were forced to accept, at least formally and often only for a short period, his suzerainty. On the other hand, the existence of the archaeologically attested shared cultural zones between Moravia, Lesser Poland and Silesia do not prove that the northern boundaries of Moravia were located over these territories. According to archaeologist Béla Miklós Szőke, the comitatus of Mosaburg in Pannonia was never part of Moravia. Neither archaeological finds nor written sources substantiate the traditional view of the permanent annexation of huge territories in his reign. Other scholars warn that it's a mistake to draw the boundaries of core territories because Moravia did not reach that development level.