Stefan Wyszyński was born to a small Polish village schoolteacher's family in the Russian-partitioned territories of Congress Poland. Ordained priest in 1924, he completed doctoral studies in canon law and Catholic social teaching at the Catholic University of Lublin (KUL) in 1929, then served as professor of social ethics at the Włocławek seminary through the 1930s. During the Nazi occupation of Poland (1939–45) he was hunted by the Gestapo as a leader of the Polish Catholic underground and spent the entire war in clandestine ministry at Polish convents and rural parishes.
He was consecrated Bishop of Lublin in 1946 and elevated to Archbishop of Warsaw-Gniezno (the dual see making him Primate of Poland) in November 1948 — the youngest Polish primate in modern history at forty-seven. His thirty-three years as Primate (1948–81) coincided exactly with the Communist Polish People's Republic. The relationship was confrontational from the start: the regime arrested him in September 1953, after he refused to accept Communist intervention in episcopal appointments, and interned him without trial under house arrest for three years (1953–56) at successive remote monasteries.
Released in October 1956 (during the Polish thaw following the Hungarian Uprising), he negotiated a remarkable modus vivendi with the regime: the Polish Catholic Church accepted limited official restrictions in exchange for the regime's accepting the Church's autonomous institutional life — a uniquely Polish settlement that preserved Catholic education, religious press, and pastoral life through the entire Communist period. The Great Novena (1957–66) — nine years of national Catholic spiritual preparation leading to the millennium of the Baptism of Poland (1966) — was his master-stroke: mobilizing the entire Polish nation in a sustained Catholic spiritual exercise that demonstrated the Church's continuing centrality in Polish life against the regime's atheist programme.
His 1978 elevation of the young Karol Wojtyła (whom he had personally mentored as a young auxiliary bishop and supported as Archbishop of Kraków) to the papacy as John Paul II — and his subsequent active partnership with John Paul II during the great years of the Solidarność movement (1980–81) — completed the work he had spent his entire ministry preparing. He died at Warsaw on May 28, 1981 — fifteen days after the John Paul II assassination attempt (at which Wyszyński, on his deathbed, was reading the Salve Regina in solidarity). Beatified September 12, 2021 by Pope Francis at Warsaw.