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The Ice Saints is a name given to St. Mamertus, St. Pancras, and St. Servatius in Flemish, French, Dutch, Hungarian, German, Austrian, Polish, Swiss, Slovene and Croatian folklore. They are so named because their feast days fall on the days of May 11, May 12, and May 13 respectively; the period from May 12 to May 15 was noted to bring a brief spell of colder weather in many years, including the last nightly frosts of the spring, in the Northern Hemisphere under the Julian Calendar. The introduction of the Gregorian Calendar in 1582 involved skipping 10 days in the calendar, so that the equivalent days from the climatic point of view became May 22–25. In Flanders St. Boniface of Tarsus is counted amongst the Ice Saints as well; St. Boniface's feast day falling on May 14.
In Poland and the Czech Republic, the Ice Saints are St. Pancras, Saint Servatus and St. Boniface of Tarsus (i.e., May 12 to May 14). To the Poles, the trio are known collectively as zimni ogrodnicy (cold gardeners), and are followed by zimna Zośka (cold Sophias) on the feast day of St. Sophia which falls on May 15. In Czech, the three saints are collectively referred to as "ledoví muži" (ice-men or icy men), and Sophia is known as "Žofie, ledová žena" (Sophia, the ice-woman).
In Sweden, the German legend of the ice saints has resulted in the belief that there are special "iron nights," especially in the middle of June, which are susceptible to frost. The term "iron nights" (järnnätter) has probably arisen through a mistranslation of German sources, where the term "Eismänner" (ice men) was read as "Eisenmänner" (iron men) and their nights then termed "iron nights," which then became shifted from May to June.
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