In Greek mythology, Dyrrhachius (Ancient Greek: Δυρράχιος) son of Poseidon and Melissa, daughter of Epidamnus. He was the eponym of the town Dyrrhachium in Illyria.Stephanus of Byzantium, s.v. Dyrrachion
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References
Stephanus of Byzantium, Stephani Byzantii Ethnicorum quae supersunt, edited by August Meineike (1790-1870), published 1849. A few entries from this important ancient handbook of place names have been translated by Brady Kiesling. Online version at the Topos Text Project.