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International relations. --- Philosophie médiévale. --- Philosophy, Medieval. --- Philosophy, Medieval. --- Political and social views. --- Political science --- Political science. --- Politics and government. --- History --- Boris --- Boris --- Petŭr --- Petŭr --- Simeon --- Simeon --- Political and social views. --- Political and social views. --- Political and social views. --- 527-1081. --- Bulgaria --- Bulgaria --- Bulgaria --- Bulgaria. --- Bulgarie --- Byzantine Empire --- Byzantine Empire --- Byzantine Empire. --- Empire byzantin --- History --- Kings and rulers --- Political and social views. --- Relations --- Histoire --- Politics and government --- Relations --- Politique et gouvernement