Editing History of Poland (section)

===Bolesław I the Brave===

Mieszko's son, Duke [[Bolesław I the Brave]] (r. 992–1025), established a [[Catholic Church in Poland|Polish Church]] structure, pursued territorial conquests and was officially crowned the first [[List of Polish monarchs|king of Poland]] in 1025, near the end of his life.<ref name="playground I xxvii-xxviii"/> Bolesław also sought to spread Christianity to parts of eastern Europe that remained pagan, but suffered a setback when his greatest missionary, [[Adalbert of Prague]], was killed in [[Prussia (region)|Prussia]] in 997.<ref name="playground I xxvii-xxviii"/> During the [[Congress of Gniezno]] in the year 1000, Holy Roman Emperor [[Otto III, Holy Roman Emperor|Otto III]] recognized the [[Roman Catholic Archdiocese of Gniezno|Archbishopric of Gniezno]],<ref name="playground I xxvii-xxviii"/> an institution crucial for the continuing existence of the sovereign Polish state.<ref name="playground I xxvii-xxviii"/> During the reign of Otto's successor, Holy Roman Emperor [[Henry II, Holy Roman Emperor|Henry II]], Bolesław fought prolonged wars with the [[Kingdom of Germany]] between 1002 and 1018.<ref name="playground I xxvii-xxviii"/><ref name="Wyrozumski 88-93">{{Harvnb|Wyrozumski|1986|pp=88–93}}.</ref>