In the aftermath of Klokotnitsa, Bulgaria emerged as the mightiest power in the Balkans. Deprived of its energetic ruler, Theodore's empire collapsed: within a few months Thrace, most of Macedonia, and Albania, fell under Bulgarian rule. As John Asen II boasted in an inscription in the Holy Forty Martyrs Church at his capital of Tarnovo, he "occupied all the land from Adrianople to Dyrrhachium, Greek, Serbian, and Albanian alike", although Dyrrhachium itself apparently remained in Greek hands. The Latin Duchy of Philippopolis was also annexed, and Alexius Slav's principality in the Rhodope Mountains was extinguished in the process, with Alexius spending the rest of his life at Asen's court.