The Roman Catholic Diocese of Łomża ) is a diocese located in the city of Łomża in the Ecclesiastical province of Białystok in Poland. The minor basilica Bazylika pw. Nawiedzenia Matki Bożej in Sejny is within the diocese.
On March 25, 1798 it was established as Diocese of Sejny/Sejna/Augustów, from the Diocese of Wigry. Its territory had formerly belonged to the Diocese of Vilna, but after the first partition of Poland it fell to Germany. Pope Pius VI carved out the new diocese and established its see at the Camaldolese monastery of Wigry, in a village about ten miles east of Suwałki. The monastery had been founded under the patronage of King Jagiello in 1418, and the Church of Our Lady, which became the cathedral, became the parish church of Wigry.
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