Lead seals in Byzantine Thrace (6th-12th c.) : Proceedings of the International Conference Sigillography Meets Historical Geography Vienna, April 19, 2023 - Gkoutzioukōstas, Andreas E.; Wassiliou-Seibt, Alexandra-Kyriaki; Drakoulēs, Dēmētrēs P. (Εκδοτικός Οίκος Κ. & Μ. Σταμούλη, 2023)