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Author: WikiMatrix
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English[en]
Over the next 10 years, Pope Adrian II and his successors made desperate attempts to regain their influence in Bulgaria and to persuade Prince Boris to leave Constantinople's sphere.
Spanish[es]
Durante los siguientes 10 años, el Papa Adriano y sus sucesores intentaron desesperadamente recuperar Bulgaria para el catolicismo y persuadir a Boris para salir de la órbita de Constantinopla.