Embedded in a gray memorial stone, a story below the altar where Pope Francis celebrated Mass on Saturday in a shrine dedicated to St. John Paul II, is a glass bubble filled with blood drawn from the Polish pontiff shortly before his death in 2005. The round, transparent vial of blood is just one of several relics of John Paul in this southern Polish city where he served as a cardinal before becoming the first-ever Polish pontiff in 1978. In the Church of the Relics, the lower of two churches in the Sanctuary of St.