Declaration of King Sigismund Augustus regarding Polish-Lithuanian union
By means of this statement, submitted at the sitting of the Sejm in 1564, King Zygmunt II August (Sigismund II Augustus) ceded to the Crown of the Kingdom of Poland the hereditary right of the Jagiellons to govern the Grand Duchy of Lithuania. Since Zygmunt had no male successor to the throne, this move was to facilitate…