Stanisław Szczepanowski or Stanislaus of Szczepanów (July 26, 1030 – April 11?, 1079) was a Bishop of Kraków known chiefly for having been slain by Polish King Bolesław II the Bold. Stanisław is venerated in the Roman Catholic Church as Saint Stanislaus the Martyr (as distinct from Saint Stanislaus Kostka).

There is little credible information about Stanisław's life. The only almost contemporary source was a chronicle of Gallus Anonymus, but the author purposely evaded writing details about a conflict with the king. Later sources are the chronicles of Wincenty Kadłubek, and two vitae (hagiographies) by Wincenty of Kielce, but all are strongly biased and contain much legendary and hagiographic matter.

According to tradition, Stanisław was born at Szczepanów, a village near the town of Bochnia in southern Poland, the only son of the noble and pious Wielisław and Bogna. He was educated at a cathedral school in Gniezno (then Poland's capital) and later, according to different sources, in Paris or Liège. On return to Poland, Stanisław was ordained a priest by Lambert Suła, Bishop of Kraków.

After the Bishop's death (1072), Stanisław was elected his successor but accepted the office only at the explicit command of Pope Alexander II. Stanisław was one of the earliest native Polish bishops. He also became a ducal advisor and had some influence on Polish politics.

Stanisław's major accomplishments included bringing papal legates to Poland, and re-establishment of a metropolitan see in Gniezno. The latter was a precondition for Duke Bolesław's coronation as king, which took place in 1076. Stanisław then encouraged King Bolesław to establish Benedictine monasteries to aid in the Christianization of Poland.

Stanisław's initial conflict with King Bolesław was over a land dispute. The Bishop had purchased for the diocese a piece of land on the banks of the Vistula River near Lublin from a certain Peter (Piotr), but after Piotr's death the land had been claimed by his family. The King ruled for the claimants, but – according to legend – Stanisław resurrected Piotr so that he could confirm that he had sold the land to the Bishop.

According to Augustin Calmet, an 18th-century Bible scholar, Stanisław asked the King for three days to produce his witness, Piotr. The King and court were said to have laughed at the absurd request, but the King granted Stanisław the three days. Stanisław spent them in ceaseless prayer, then, dressed in full bishop's regalia, went with a procession to the cemetery where Piotr had been buried three years earlier. He had Piotr's grave dug up until his remains were discovered. Then, before a multitude of witnesses, Stanisław bade Piotr rise, and Piotr did so.

Piotr was then dressed in a cloak and brought before King Bolesław to testify on Stanisław's behalf. The dumbfounded court heard Piotr reprimand his three sons and testify that Stanisław had indeed paid for the land. Unable to give any other verdict, the King dismissed the suit against the Bishop. Stanisław asked Piotr whether he would remain alive but Piotr declined, and so was laid to rest once more in his grave and reburied.

A more substantial – and historically more credible – conflict with King Bolesław arose after a prolonged war in Ruthenia, when weary warriors deserted home, alarmed at tidings that their overseers were taking over their estates and wives. According to Kadłubek, the King punished the soldiers' faithless wives very cruelly and was criticized for it by Bishop Stanisław. Jan Długosz, however, writes that the Bishop had in fact criticized the King for his own sexual immorality. According to recent historians, Stanisław took part in a plot of nobles, aimed to gain more powers or dethrone the king. Gallus Anonymus in his laconic account only condemned both "traitor bishop" and violent king.

Whatever the actual cause of the conflict between them, the upshot was that the Bishop excommunicated King Bolesław. The excommunication aided the King's political opponents, and the King accused Bishop Stanisław of treason and had him killed.

Legend has it that King Bolesław sent his men to execute Bishop Stanisław without trial, but that when they dared not touch the Bishop, the King decided to kill the traitor himself. He is said to have slain Stanisław while he was celebrating Mass in the Skałka outside the walls of Kraków. According to Paweł Jasienica: Polska Piastów, it was actually in Wawel castle. 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.

The exact date of Stanisław's death is uncertain. According to different sources, it was either April 11 or May 8, 1079.

The murder stirred outrage through the land and led to the dethronement of King Bolesław II the Bold, who had to seek refuge in Hungary and was succeeded by his brother, Władysław I Herman.

Whether Stanisław should be regarded a traitor or a hero, remains one of the classic unresolved questions of Polish history. Stanisław's story has a parallel in the murder, nine decades later, in 1170, of Thomas Becket by henchmen of England's King Henry II.

The cult of Saint Stanisław the martyr began immediately upon his death. In 1088 his relics were translated (i.e. moved) to Kraków's Wawel Cathedral. In the early 13th century, Bishop Iwo Odrowąż initiated preparations for Stanisław's canonization and ordered Wincenty of Kielce to write the martyr's vita. On September 17, 1253, at Assisi, Stanisław was canonized by Pope Innocent IV.

Subsequently Pope Clement VIII set the Saint's feast day for May 7 throughout the Roman Catholic Church, though Kraków observes it May 8, the supposed date of the Saint's death. The first feast of Saint Stanisław in Kraków was celebrated May 8, 1254, and was attended by many Polish bishops and princes. As the first native Polish saint, Stanisław is the patron of Poland and Kraków, and of some Polish dioceses. He shares the patronage of Poland with Saint Adalbert of Prague, Florian, and Our Lady the Queen of Poland.

Wawel Cathedral, which holds the Saint's relics, became a principal national shrine. Almost all the Polish kings beginning with Władysław I the Elbow-high were crowned while kneeling before Stanisław's sarcophagus, which stands in the middle of the cathedral. In the 17th century, King Władysław IV Vasa commissioned an ornate silver coffin to hold the Saint's relics. It was destroyed by Swedish troops during The Deluge, but was replaced with a new one ca. 1670.

Saint Stanisław's veneration has had great patriotic importance. In the period of Poland's feudal fragmentation, it was believed that Poland would one day reintegrate as had the members of Saint Stanisław's body. Half a millennium after Poland had indeed reintegrated, and while yet another dismemberment of the polity was underway in the Partitions of the Polish-Lithuanian Commonwealth, the framers of the Polish Constitution of May 3, 1791, would dedicate this progressive political document to Saint Stanisław Szczepanowski, whose feast day fell close to the date of the Constitution's adoption.

Each year on May 8, a procession, led by the Bishop of Kraków, goes out from Wawel to the Church on the Rock. The procession, once a local event, was popularized in the 20th century by Polish Primate Stefan Wyszyński and Archbishop of Kraków, Karol Wojtyła. The latter, as Pope John Paul II, called Saint Stanisław the patron saint of moral order.

Roman Catholic churches belonging to Polish communities outside Poland are often dedicated to Saint Stanisław.

In iconography, Saint Stanisław is usually depicted as a bishop holding a sword, the instrument of his martyrdom, and sometimes with Piotr rising from the dead at his feet.

* List of Roman Catholic bishops of Kraków * List of saints * Gaude mater Polonia * Order of Saint Stanislaus