Summary The present volume contains the papers from the 12th International Symposium of Byzantine Sigillography, held at the State Ermitage Museum in St. Petersburg, May 27-30, 2019. The papers discuss seals as historical sources and archaeological findings, presenting their role in the Byzantine prosopography, administration, historical geography and art history. TABLE OF CONTENTS Collections and Finds Vera Bulgurlu, Seals from the Basilica of St. John the Theologian in Ayasuluk Ioanna Koltsida-Makre - Yorka Nikolaou, Unpublished Byzantine Lead Seals from the Acquisitions of the Athens Numismatic Museum Collections Nikolaos Mastrochristos, Lead Seal of John VIII Palaiologos from Rhodes Christos Stavrakos - Zafeiris Syrras, A Selection of Important Seals from the Private Collection of Zafeiris Syrras History, Prosopography and Administration Andreas Gkoutzioukostas, The Office of oikistikos: A Re-examination of the Sigillary Material and an Unpublished Lead Seal from Konstantinos Kalantzes' Collection Werner Seibt, The Byzantine Eastern Frontier in the 1070s Werner Seibt, Auch der georgische Aristokrat Va??e Lip'arit? emigrierte in der zweiten H lfte des 11. Jahrhunderts in das Byzantinische Reich Byzantium and Beyond Michael N. Boutyrski, The bulla of Joseph, Metropolitan of Rosia Jean-Claude Cheynet, Les sceaux du bureau du g nikon hors des fronti res de l'Empire Elena Stepanova - Piotr Gaydukov - Oleg Oleynikov, A Collection of Byzantine Seals from Velikij Novgorod Alexandra-Kyriaki Wassiliou-Seibt - Volker Hilberg, Byzantium and Beyond: Siegel aus Skandinavien Piety Gert Boersema, Sigillographic Evidence for Early Byzantine Jerusalem Pilgrimage Technology and Management Maria Teresa Catalano, Nutzen und Grenzen der RTI-Fotografie am Beispiel von zwei stark besch digten byzantinischen Bleisiegeln George Kakavas - Niki Katsikosta - Eleni Kontou, Integrated Management of Lead Seals: The Case of the Numismatic Museum, Athens-Greece Index of Proper Names and Terms Index of Iconography Index of Metrical Inscriptions