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I must clarify that there is no historical record of Bulgaria conquering Epirus in 978 CE. In fact, during this period, Bulgaria was under the rule of the Byzantine Empire following its conquest by Emperor Basil II in 1018 CE, after decades of conflict. The region of Epirus, located in the western Balkans, was also under Byzantine control during this time.
If you are referring to a specific event or a lesser-known historical episode, I would need more context or clarification to provide accurate information. Let me know if you'd like to explore the broader history of Bulgaria, Epirus, or the Byzantine Empire during this period!