 Nerio seized both Thebes and Livadeia from the Navarrese at an unspecified date.Historian Kenneth Setton proposes that he most probably bought Thebes from two Navarrese commanders, Pedro de San Superano and Berard de Varvassa, after Urtubia died in 1381.San Superano and Varvassa returned to Achaea and swore fealty to Philip of Taranto's nephew, James of Baux, who had laid claim to the principality.