https://archaeologyinbulgaria.com/2016/01/15/archaeologists-find-north-gate-of-ancient-agathopolis-in-bulgarias-ahtopol-brand-new-gold-coin-of-byzantine-emperor-justine-i/
Archaeologists Find North Gate of Ancient Agathopolis in Bulgaria’s Ahtopol, ‘Brand New’ Gold Coin of Byzantine Emperor Justine I