Jordan arrived in Mieszko I’s pagan country in the 10th century with the strictly defined purpose of Christianising the Duke and his subjects. He is the one who baptised the Duke in 966, organized Poznań’s first bishopric and constructed Poland’s first cathedral. The Chronicles mention an extraordinary gift – St. Peter’s sword – presented to him by the Pope. Today this relict, one of Poland’s oldest, is on display in the Archdiocesan Museum. St. Peter’s sword is the relic with the longest documented history in Poland.