Nieznana pieczęć odnaleziona przy dokumencie Unii lubelskiej

The act of the Polish-Lithuanian Union of 1569, so-called The Union of Lublin, is preserved in the holdings of the Central Archives of Historical Records in Warsaw in the collection of parchment records (ref. No. 5627). This is the 16th c. parchment document with a large group of pendant wax seals. Until now it was thought that 77 seals were attached to the document. However, during the restoration work carried out in the Central Laboratory for Conservation of Archive Materials in Warsaw was revealed another previously unknown seal. This article describes this seal as well as the attempts to identify its owner.