Quigualtam or Quilgualtanqui was a powerful Native American Plaquemine culture polity encountered in 1542–1543 by the Hernando de Soto expedition. The capital of the polity and its chieftain also bore the same name; although neither the chief nor his settlements were ever visited in person by the expedition. Their encounters consisted of messages sent by runners and a three-day long canoe battle on the Mississippi River. Multiple archaeological cultures, archaeological sites, and protohistoric and early historic period Native American groups have been proposed by historians and archaeologists to identify the polity, but their identity will probably never be known with any degree of certainty.