The Normans defeat the Byzantine Empire in the Battle of Dyrrhachium.

The Battle of Dyrrhachium in 1081 was a crucial conflict fought between the Normans, led by Robert Guiscard, and the Byzantine Empire, commanded by Emperor Alexios I Komnenos. This battle took place near the city of Dyrrhachium (modern-day Durrës, in Albania) on October 18, 1081, and it marked the beginning of the Norman invasion of Byzantine territories in the western Balkans.