Adalbert (Czech: Vojtěch, Polish: Wojciech, Germanic equivalent Adalbert - the joy of warrior) was born of a noble family in Libice, Bohemia about the year 956. He studied for ten years in Magdeburg under Saint Adalbert. When Adalbert died, Vojtech took on the name Adalbert Vojtech. The popes sent him several times to Bohemia. Adalbert baptized Geza of Hungary and his son Stephen, and he also worked to convert the Poles.
Adalbert became the bishop of Prague. However, he strongly resented the participation of formally Christian inhabitants in slave trade. Slavic slaves were later traded by Jewish traders to Muslim empire. He escapes from Prague, despite the wow from Pope to return to his dignity.
Adalbert Vojtech of Prague had already in 977 entertained the idea of becoming a missionary in Prussia. After he had converted Hungary, he was sent by the pope to convert the heathen Prussians. Boleslaw I Chrobry, duke of Poland sent soldiers with Adalbert. Adalbert and his followers entered Prussia territory near Gdansk and went along the Baltic Sea coast.
It was a standard procedure of Christian missionaries to try to chop down sacred oak trees (see Iconoclasm), which they had done in many other places, including Saxony. Because the trees were worshipped and the spirits who were believed to inhabit the trees were feared for their powers, this was done to demonstrate to the non-Christians that no supernatural powers protected the trees from the Christians.
When they did not heed warnings to stay away from the sacred oak groves, Adalbert was martyred April A.D. 997 at the Baltic Sea coast between the Nogat river and Fischhausen in Samland/Sambia. It is said that his body was bought back for its weight in gold by Boleslaus I of Poland. This investment perfectly paid off.
A few years later Adalbert was canonized as Saint Adalbert of Prague. His life has been written about in 'Vita St Adalberti' by various writers, the earliest was traced to imperial Aachen and Lüttich, although it was assumed for many years that the Roman monk John Canaparius had written the first 'Vita'.
Saint Adalbert bones were stored in Gniezno and helped Boleslaus I of Poland to improve a position of Poland in Europe (see Meeting in Gniezno).
In 1037 Bohemian King Bretislav I retrieved the bones of Saint Adalbert from Gniezno and moved it to Prague.
Saint Adalbert became the patron saint of Bohemia, Hungary, Poland and Province of Prussia.