Gaude Mater Polonia (Polish, "Rejoice, oh Mother Poland") was probably the most popular medieval Polish anthem, written in the 13th--14th century in memory of Saint Stanisław Szczepanowski, Bishop of Kraków. Polish knights used to sing it after victory in battle, presumably to one of the Gregorian melodies associated with the Eucharistic hymn, O Salutaris Hostia, on which it is based.

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