Saint Stanislaus of Krakow was born at Szczepanów, a village in Lesser Poland. He was the only son of the noble and pious Wielisław and Bogna. He was educated at a cathedral school in Gniezno (then the capital of Poland) and later, probably at Paris.
On his return to Poland, Stanislaus was ordained a priest by Lambert II Suła, Bishop of Kraków. Following his ordination, he was given a canonry in Kraków and became known for his preaching. He was subsequently made pastor of Czembocz near Kraków, canon and preacher at the cathedral, and later, vicar-general.
After the bishop’s death (1072), Stanislaus was elected his successor but accepted the office only at the explicit command of Pope Alexander II. Stanislaus was one of the earliest native Polish bishops. He also became a ducal advisor and had some influence on Polish politics.
Stanislaus’ major accomplishments included bringing papal legates to Poland, and reestablishment of a metropolitan see in Gniezno. He was the Bishop of Kraków known chiefly for having been martyred by the Polish king Bolesław II the Generous. Stanislaus is venerated in the Roman Catholic Church as Saint Stanislaus the Martyr.
Sources:
https://en.wikipedia.org/wiki/Stanislaus_of_Szczepan%C3%B3w
Britannica, The Editors of Encyclopaedia. "Saint Stanislaus of Kraków". Encyclopedia Britannica
Fr. Paolo O. Pirlo, SHMI (1997). "St. Stanislaus". My First Book of Saints. Sons of Holy Mary Immaculate - Quality Catholic Publications. pp. 80–81.