Byzantine mosaic of troas, a fortified city with a horse.

Extract to a mosaic showing Paul's second missionary journey (Acts 16) to: Antioche / Ephèse / Troas / Neapolis (Kavala) / Philippes / Thessalonique / Bérée / Athènes / Corinthe . Here it's Troas. You can find another photo with the entire mosaic in my account.