Demetrios, metropolitan bishop of Kyzikos, 10th century. Seal (Lead, 23 mm, 7.84 g, 12 h). AΓ, / ΔH/MH-TPI/Є RO/HΘ Bust of St. Demetrios, nimbate, wearing jeweled chlamys and tablion, holding martyr's cross in his right hand. Rev. +ΔHMH/TPIⲰ MH/TPOΠOΛI/TH KVZI/KOV ✱ in five lines. DO Seals III, 53.3. Laurent, Corpus V/1, 350. Zacos 446. Very well preserved and with an exceptional portrait of St. Demetrios. Good extremely fine.

Our Demetrios, the bishop of Kyzikos, may well be the addressee of a letter by patriarch Nikolaos I Mystikos (912-925) containing advice on how to approach some disobedient clerics in his diocese