Bull of Gniezno

The Polish church supported the appointment of the Antipope Anacletus II, while Saint Norbert of Xanten, Archbishop of Magdeburg, remained faithful to Innocent.

In Norbert's last years, he was chancellor and adviser to Lothair II, the Holy Roman Emperor, and persuaded him to lead an army to Rome to restore Innocent to the papacy in 1133.

In August 1135, in exchange for the independence of the Polish episcopate, Bolesław III Wrymouth, Duke of Poland, declared himself a vassal of Emperor Lothair and agreed to pay tribute to the Holy Roman Empire.

On July 7, 1136, Pope Innocent upheld the independence of the Polish church from the Archdiocese of Magdeburg in a papal bull entitled Ex commisso nobis.

Upon the document's return, the National Library of Poland performed a series of tests on the bull under the authority of Professor Andrzej Wyczański.