Gaude Mater Polonia is a polish medieval hymn and one of the oldest polish-latin lyric composed on gregorian chant „Oh salutaris Hostia”, on the occasion of pre-canonization of Stanislaus of Szczepanów. The hymn was written by Wincenty of Kielcza. In the times of the last crowned kings from the Piast dynasty, it served as the royal anthem. The song was first published on 8 may 1254, the oldest record comes from Kielce Antiphonary from 1372. During middle ages the hymn was chanted by polish knights after battle. Later the hymn was used on the national events.