The first known historic record comes from 1010, in Thietmar of Merseburg's chronicles,[3] after the troops of King Henry II of Germany in the conflict over the March of Lusatia and the Milceni lands had attacked the forces of the Polish Duke Bolesław I Chrobry and again besieged Głogów on August 9, 1017 without result. The next year Henry and Bolesław concluded the Peace of Bautzen.
In 1109, King Henry V of Germany, entangled in the fratricidal war between the Piast dukes Bolesław III Wrymouth and Zbigniew besieged the town, but could not overcome the Polish forces in the Battle of Głogów. In 1157 the town finally fell to the forces of Emperor Frederick I Barbarossa, invading the Silesian lands in aid of Duke Władysław II the Exile and his sons.