Bulgarian Archaeologists Discover Unique Medieval Byzantine Seal Archaeology | August 21, 2009, Friday Bulgarian archaeologist, Prof. Kazimir Popkonstantinov, has discovered a unique medieval seal at the site of the Knyazhevski (i.e. "Princely") Monastery near the Eastern city of Varna. The seal is dated back to the 10th century and belonged to the Byzantine dignitary Antonius, who was an imperial protospatario in Constantinople. Antonius had correspondence with a representative of the Knyazhevski Monastery, who is believed to have been the Bulgarian Knyaz (i.e. king) Boris I (r. 852-889 AD) himself. The team of archaeologist Popkonstantinov from the University of Veliko Tarnovo...