The paper discusses a recent find of a copper alloy light cannon discovered at the Old Castle in Grodno, Belarus. The research aim was to analyse the artefact in all its possible aspects, including archaeological and historical contexts, possible analogies, and the gun’s technology of manufacture. This latter was done against a broad comparative background of what is known on manufacturing technologies of late medieval and modern period copper alloy firearms. First, the archaeological and historical contexts of the discovery are dealt with. Then, the morphology and typochronology of the cannon are discussed and relevant analogies are proposed. Next, the technology of manufacture of the cannon is studied on the basis of metallographic examinations and EDS analyses of the metal’s elemental composition. It was found out that the artefact had been made of leaded copper. The cannon can be dated with reasonable certainty to the late 14th c., as implied both by the find context, the morphology and the chemical composition of the artefact. Its deposition can be related to fights over the Old Castle in Grodno in this period, waged by Teutonic, Polish and Lithuanian forces. It can tentatively be proposed that the cannon was manufactured in a Teutonic Order’s workshop, but further research is necessary to verify this supposition.

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In 2021, during excavations of the knight’s manor house at Mierzyn, which belonged to the Nagodzice family, a lead bull of theantipope John XXIII (1410-1415) was found. The seal was discovered in the area of the economic hinterland, a few hundred metres south of the stronghold. This is the second archaeological find of a bull of this antipope from the territory of Poland. The article discusses the object in relation to other finds of this kind and in the context of the history of the medieval knight’s seat in Mierzyn.

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