Five years later, Boleslaus requested that the Pope send Adalbert back to Prague, in hopes of securing his family's support.Pope John XV agreed, with the understanding that Adalbert was free to leave Prague if he continued to encounter entrenched resistance.He was forced to leave this first village after being struck in the back of the head by an oar by a local chieftain, causing the pages of his book to scatter upon the ground.The mob was led by a man named Sicco,[16] possibly a pagan priest,[17] who delivered the first blow against Adalbert, before the others joined in.Notably, the Přemyslid rulers of Bohemia initially refused to ransom Adalbert's body from the Prussians who murdered him, and therefore it was purchased by Poles.Thus Adalbert's bones were preserved in Gniezno, which assisted Boleslaus I of Poland in increasing Polish political and diplomatic power in Europe.In 1928, one of the arms of Adalbert, which Bolesław I had given to Holy Roman Emperor Otto III in 1000, was added to the bones preserved in Gniezno.The massive bronze doors of Gniezno Cathedral, dating from around 1175, are decorated with eighteen reliefs of scenes from Adalbert's life.They are the only Romanesque ecclesiastical doors in Europe depicting a cycle illustrating the life of a saint, and therefore are a precious relic documenting Adalbert's martyrdom.Representatives of Catholic, Eastern Orthodox, and Evangelical churches traveled on a pilgrimage to Adalbert's tomb located in Gniezno.Pope John Paul II visited the cathedral and celebrated a liturgy there in which heads of seven European nations and approximately one million faithful participated.A ten-meter cross was erected near the village of Beregovoe (formerly Tenkitten), Kaliningrad Oblast, where Adalbert is thought to have been martyred by the Prussians.[30] The Dagmar and Václav Havel VIZE 97 Foundation Prize, given annually to a distinguished thinker "whose work exceeds the traditional framework of scientific knowledge, contributes to the understanding of science as an integral part of general culture and is concerned with unconventional ways of asking fundamental questions about cognition, being and human existence" includes a massive replica of Adalbert's crozier by Czech artist Jiří Plieštík.