There is only one approved Marian apparition in Poland. The Church in the town of Gietrzwałd at this time was facing difficult circumstances. In 1873 the Polish language had been banned in all the schools in the region. As a result of the Kulturkampf, “rebellious” Catholic priests and religious congregations were removed from Warmia. Thus was the social context on June 27, 1877, when 13-year-old Justyna Szafryńska was on her way back home from the church in Gietrzwałd. As she prayed the Angelus, she saw a strange light and a figure dressed in white on the maple tree near the presbytery; the figure was seated on a gold, pearl-studded throne.
A moment later the girl saw the glowing figure of an angel; with golden wings, clad in white, the angel descended from heaven. When the young Justyna prayed the Hail Mary, the figure rose from the throne and ascended into heaven together with the angel. On June 30th, Our Lady appeared on her own, unaccompanied by angels. During the apparition Justyna asked: “What do you want, Holy Mary?” The reply she received was, “I want you to pray the Rosary daily.”
On September 1, 1977, centennial celebrations took place, presided over by the future pope Saint John Paul II, Cardinal Karol Wojtyła. On that day Bishop Józef Drzazga of Warmia solemnly recognized the veneration of the Blessed Virgin Mary in Gietrzwałd. He issued a decree validating the credibility of the apparitions and proclaiming them as in compliance with Christian faith and morality.
Adapted from Aleteia.org