Saint Casimir's Day is celebrated on March 4, the anniversary of the death of Saint Casimir, the patron saint of Lithuania and Poland. The Kaziuko mugė, a folk arts and craft fair, is traditionally held on the Sunday nearest to March 4.
St. Casimir is the patron saint of many Roman Catholic Churches in the United States which were established by Polish or Lithuanian immigrants. He is the principal patron saint of Lithuania. Casimir was a royal prince of the ruling Jagiellon dynasty of Poland and Lithuania, while St. Stanislaus of Krakow is usually cited as Poland's principal patron saint.
St. Casimir's Day in many Roman Catholic parishes is marked with a special Mass said in his honor. His feast day, March 4, is commemorated optionally according to the Liturgical Calendar of the United States Conference of Bishops. It is, however, kept with great reverence in Roman Catholic parishes of ethnic Polish or Lithuanian origin.
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