The Archdiocese of Wrocław (; ; ; ) is a Latin Church ecclesiastical territory or archdiocese of the Catholic Church centered in the city of Wrocław in Poland. From its founding as a bishopric in 1000 until 1821, it was under the Archbishopric of Gniezno in Greater Poland. From 1821 to 1930 it was subjected directly to the Apostolic See. Between 1821 and 1972 it was officially known as (Arch)Diocese of Breslau. History Medieval era (within Poland) Christianity was first introduced into Silesia by missionaries from Moravia and Bohemia. After the conversion of Duke Mieszko I of Poland and the conquest of Silesia, the work of bringing the people to the new faith went on more rapidly. Up to about the year 1000 Silesia had no bishop of its own, but was united with neighbouring dioceses. The upper part of the Oder River formed the boundary of the Kingdom of Poland. All the territory which is now Silesia – lying on the right-hand bank of the Oder – belonged, therefore, to the Diocese of Poznań, which was suffragan to the Archbishopric of Magdeburg. This part of Silesia was thus under the jurisdiction of a priest named Jordan who was appointed first Bishop of Poznań in 968. The part of Silesia lying on the left bank of the Oder belonged to the territory included in then Bohemia, and was consequently within the diocesan jurisdiction of Prague. The Bishopric of Prague, founded in 973, was suffragan to the Archbishopric of Mainz. Duke Bolesław I the Brave, the son of Mieszko, obtained the Bohemian part of Silesia during his wars of conquest, and a change in the ecclesiastical dependence of the province followed. By a patent of Emperor Otto III in 995, Silesia was attached to the Bishopric of Meissen, which, like Poznań, was suffragan to the Archbishopric of Magdeburg. Soon after, Bolesław, who ruled all of Silesia, and emperor Otto, to whom Bolesław had pledged allegiance, founded the Diocese of Wrocław, which, together with the Bishoprics of Kraków and Kołobrzeg, was placed under the Archbishopric of Gniezno in Greater Poland, founded by Otto in 1000 during the Congress of Gniezno. The first Bishop of Wrocław is said to have been named Jan, but nothing more than this is known of him, nor is there extant any official document giving the boundaries of the diocese at the time of its erection. However, they