BYZANTINE EMPIRE. John Comnenus-Ducas. As emperor of Thessalonica, 1237-1242. Æ trachy. .56 gm. 17 mm. Thessalonika mint. Facing bust of winged cherubim / John and St. Demetrius standing facing, holding long cross surmounted by globule between them. SB 2210. DOC 25. Very Fine; dark brown patina; unusually clear example.