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http://archaeologyinbulgaria.com/2018/09/26/first-ever-gold-coin-found-in-bulgarias-lyutitsa-fortress-of-byzantine-nicaean-emperor-john-iii-ducas-vatatzes/
First Ever Gold Coin Found in Bulgaria’s Lyutitsa Fortress, of Byzantine (Nicaean) Emperor John III Ducas Vatatzes