Who are the eleven kings that fight against King Arthur?

The eleven kings that fight against King Arthur are often referred to in various Arthurian legends, with key figures typically including King Lot of Orkney, King Urien of Gore, King Agravain, King Geraint, King Pellinore, King Bedivere, King Lamorak, King Caradoc, King Leodegrance, King Mark of Cornwall, and King Roderick. These kings often unite against Arthur due to jealousy, rivalry, or disputes over territory. Their conflicts illustrate the challenges Arthur faces in uniting Britain and maintaining his rule. The specific kings may vary across different texts and interpretations of the Arthurian mythos.