LTReikšminiai žodžiai: Gnieznas; Gniezno arkivyskupijos archyvas; Gniezno chartijos; Epistoliarija; Lenkijos arkivyskupas; Abiejų Tautų Respublika (ATR; Rzeczpospolita Obojga Narodów; Žečpospolita; Sandrauga; Polish-Lithuanian Commonwealth); Gniezno; Archdiocesan Archive of Gniezno; Gniezno charters; Epistolary; Primate of Poland.
ENThe article discusses archival sources pertinent to the broadly understood history of the Grand Duchy of Lithuania, kept at the Archdiocesan Archives of Gniezno. Apart from the excluded from this study protocols of the sittings of the Metropolitan Chapter of Gniezno and of the Gniezno Consistory General, the author considers individual items from the collections: Gniezno Diplomas, Old Polish Epistolography, and from the regular paperwork of the Consistory Court. The article is supplemented with the critical edition of the document issued in 1573 by Bishop Walerian Protasewicz of Vilnius and his Cathedral Chapter (Dypl. Gn. sygn. 820), protesting against the Warsaw Confederation. [From the publication]