Formation of the Piast Polish State

Timeline

1. 901–992Greater Poland and Lesser Poland · PolandMieszko I began ruling around 960, consolidating the core of Greater Poland and forming foreign alliances. He was baptized in 966. He died in Poznań on 25 May 992, passing the throne to Bolesław I.
2. c. 966–1000Core Polish territories · PolandAfter baptism Poland entered the Latin Christian system. On 11 March 1000 Otto III made a pilgrimage to Gniezno to venerate the tomb of Saint Adalbert, elevating Gniezno to an archbishopric with suffragan bishoprics at Kraków, Wrocław, and Kołobrzeg, freeing it ecclesiastically from Magdeburg's jurisdiction.
3. c. 1025Gniezno · Greater Poland VoivodeshipAt the Congress of Gniezno Otto bestowed on Bolesław titles such as 'brother and collaborator of the Empire,' and the two exchanged copies of the Holy Lance and relics of Saint Adalbert; whether this amounted to a royal coronation is disputed by scholars. Bolesław was crowned King of Poland at Gniezno Cathedral in 1025 and died on 17 June of that year.