Kantakouzenos was still in control of part of the Byzantine army. On 26 October 1341, he answered by proclaiming himself emperor at Didymoteicho. This was the beginning of a civil war that would last until 1347. Ivan Alexander of Bulgaria soon allied with the faction under John V and Anna while Stefan Uroš IV Dušan of Serbia sided with John VI. Both rulers were actually taking advantage of the civil war for their own political and territorial gains. In time John VI would ally himself with Orhan I of the nascent Ottoman emirate.