By early 1393 Turnovo Bulgaria's Ivan Shishman, hoping to throw off his onerous vassalage, was in secret negotiations with Sigismund, along with Wallachian Voievod Mircea the Old (1386–1418) and, possibly, Vidin's Ivan Sratsimir. Bayezid got wind of the talks and launched a devastating campaign against Shishman. Turnovo was captured after a lengthy siege, and Shishman fled to Nikopol. When that town fell to Bayezid, Shishman was captured and beheaded. All his lands were annexed by the sultan, and Sratsimir, whose Vidin holdings had escaped Bayezid's wrath, was forced to reaffirm his vassalage.