The piece of trunk below was sprinkled with blood of St. Stanislaus during his execution.
Saint Stanislaus the Martyr is a patron saint of Poland.
Stanislaus of Szczepanów, or Stanisław Szczepanowski, (July 26, 1030 – April 11, 1079) was the Bishop of Krakow and stood in opposition to the brutal king Bolesław II the Bold (who was eventually exiled). He opposed the king's immoral behavior and his ruthless treatment of women. St. Stanislaus was a man who had the courage of his convictions. He stood his ground to the king.
King Bolesław sent his men to execute Bishop Stanisław without trial but when they didn't dare to touch the Bishop, the King decided to kill the bishop himself. He is said to have slain Stanisław while he was celebrating Mass. The Bishop's body was then hacked to pieces and thrown into a pool outside the church. According to the legend, his members miraculously reintegrated while the pool was guarded by four eagles.

On September 17, 1253, at Assisi, Stanisław was canonized by Pope Innocent IV.

http://en.wikipedia.org/wiki/Stanislaus_of_Szczepan%C3%B3w