In 1945, the Cathedral was in ruins. Its restoration was preceded by archaeological research that turned up relics under the Cathedral floor. Although rather unimpressive, the objects revolutionised views on the origins of Poland. The artefacts are considered to be the remains of a baptismal pool. This site may well be where Duke Mieszko was baptised, ushering his country into the world of Christian Europe. The Poznań Cathedral was erected through the joint efforts of both Mieszko I and Bolesław the Brave. It came to symbolise the independence and might of their fledgling state. No wonder it was chosen as the burial place of these first rulers: Mieszko died in 992, his son Bolesław in 1025. Much like the Cathedral itself, the graves of the Piast dynasty rulers were destroyed during a raid by the Czech Duke Bretislaus in 1039. The cellars conceal remnants of Poland’s first cathedral, constructed after the establishment of Poznań’s bishopric in 968. Another cathedral was built in its place, the decorative Romanesque columns of which have survived to this day. At the time, the design, building technology, shape, size and symbolism of the edifice were all unprecedented in Poland. Its crypt holds the mortal remains of Poznań’s archbishops and Poland’s primates.