[2] He did his ecclesial studies just before World War II broke out and was a brief hostage of the Gestapo after the Nazi forces invaded Poland in 1939.

He did his theological studies in the Jagiellonian and then received his sacerdotal ordination to the priesthood on 5 April 1936 (Palm Sunday) from the then-Archbishop Adam Stefan Sapieha in the Saint Francis church.

[1] The Nazi forces invaded Poland therefore instigating World War II and for a brief time the Gestapo held him hostage.

Pietraszko from September 1948 until his death served in the Saint Anne church where from 18 February 1957 he would act as the "de facto" parish priest in the absence of a pastor.

He received his episcopal consecration on 15 April 1963 from Cardinal Stefan Wyszyński in the Wawel Cathedral; the principal co-consecrators were Bishops Karol Józef Wojtyła (with whom he became close friends) and Julian Jan Groblicki.

He fought for the creation of new churches despite the atheistic communist regime prohibiting this and it put him under the radar of the secret service who began their watch over him since around 1970.

[1] It was an exceptional case after being made a bishop that Pietraszko did not resign his position as a parish priest to accept his episcopal nomination since he wished to remain a simple pastor.

The formal launch to the cause came on 7 July 1994 after the Congregation for the Causes of Saints in Rome issued the "nihil obstat" (no objections) decree and titled Pietraszko as a Servant of God.

This dossier was the culmination of all the evidence gathered during the diocesan phase; it detailed the late bishop's life and his reputation for holiness thus making the official argument for his becoming a saint.