Azimuntium (Azimus, or Esimontou) was a fortified town in Thracian region near the Illyrian border of the Eastern Roman Empire (present day Greece). The town is described by the Greek historian as the being the only one of the 182 forts and castles of Thrace to resist during the Attilan War of 443-446 A.D. and separately negotiating an exchange of captives with Attila after the peace was declared in 446 A.D.