with the inscription CIVITAS GNEZDVM, c. 992–1000 In 966,
Mieszko I, the ruler of the
Polans, accepted
Christianity through the auspices of the
Roman Church in the
Baptism of Poland. According to
Gallus Anonymus, it was Mieszko's first wife,
Dobrawa, the daughter of
Boleslaus I, Duke of Bohemia, who convinced her husband to convert to Christianity. Also, the chronicler,
Thietmar of Merseburg, attributed Mieszko's conversion to Dobrawa's influence. The Baptism also had political significance and was most likely intended to bring Mieszko's state closer to the
Duchy of Bohemia and to prevent future attacks by the
Holy Roman Empire in an attempt to Christianize Mieszko's lands by force. Subsequently, Mieszko's realm was recognised by the
papacy and accepted as part of
Christendom. In 968, a missionary
bishopric was established in
Poznań. The regesta titled
Dagome iudex first defined Poland's geographical boundaries with its capital in
Gniezno and affirmed that the state was under the protection of the Popes. Following the death of Mieszko I, his eldest son,
Bolesław I the Brave, became the next Duke of Poland in 992. Bolesław I quickly consolidated his rule, expelling his stepmother, Oda, and half-brothers from Poland. He also expanded the borders of the early Polish state by taking
Lusatia,
Moravia,
Upper Hungary, and
Red Ruthenia. In 1000, he organized the
Congress of Gniezno and obtained the right of investiture from
Otto III, the
Holy Roman Emperor, who assented to the creation of three additional bishoprics in
Kraków,
Kołobrzeg, and
Wrocław and an
archdiocese in Gniezno. During the meeting of the two rulers, Otto also bestowed upon Bolesław I royal
regalia and a replica of the
Holy Lance, which were later used at his coronation as the first King of Poland in 1025, when Bolesław I received permission for his coronation from
Pope John XIX, an event that elevated Poland from a
duchy to a
kingdom. == Territory ==