„Iungit et sociat jedne członki i serca z dawności naszych” – o unii hadziackiej w 360 rocznicę. O unii hadziackiej raz jeszcze

The title of the article was taken from a letter written by a group of senators and sent on May 17, 1657, to Bohdan Khmelnytsky. The letter expresses the hope that Khmelnytsky together with the Zaporozhian army will support a reunion with the Republic of Poland. Also in other contemporary sources, we talk about connecting and uniting, about the Christian community. The author also recalls a book titled 350th anniversary of the Union of Hadiach (1658–2008), edited by T. Chynczewska-Hennel, P. Kroll, and M. Nagielski (Warsaw 2008). This collection of post-conference articles is a synthetic account of the results of a historical research carried out by scientists from Poland, Ukraine, Russia, Lithuania, Italy, Canada, and France. All researchers combine topics related to the history of the Union of Hadiach. The problem of the Union of Hadiach is connected to many issues referred to in the article but above all with the fundamental issue: linking the history of Ukraine with the political goals of Russia.