In the wake of the death of Ivan Alexander, the Bulgarian Empire was subdivided into three kingdoms among his sons, with Ivan Shishman taking the Tаrnovo Kingdom situated in central Bulgaria and his half brother Ivan Sratsimir holding the Vidin Tsardom. Although his struggle to repel the Ottomans differentiated him from the other rulers on the Balkans like the Serbian despot Stephan Lazarevic who became a loyal vassal to the Ottomans and paid annual tribute and participated in all of the Ottoman campaigns subsequent to the battle of Kosovo, contributing a 5,000 strong contingent of christian knights. Although Ivan Shishman has been categorized as indecisive and inconsistent in his policy in the past, this was done with little regard for an understanding of the context of the conditions and limited resources that this ruler had at his disposal.