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http://archaeologyinbulgaria.com/2018/08/02/unknown-4th-century-tower-gold-coin-of-byzantine-emperors-andronicus-ii-andronicus-iii-found-in-bulgarias-rusocastro-fortress/
Unknown 4th Century Tower, Gold Coin of Byzantine Emperors Andronicus II, Andronicus III Found in Bulgaria’s Rusocastro Fortress