Les Saints de Glace

On the 11th, 12th and 13th May of each year, in France, there is a celebration of 'Les Saints de Glace' meaning 'Saints of Ice'. From the popular beliefs of Europe, the north of the Mediterranean's sea, Saint Mamert, Saint Pancrace and Saint Servais are implored by the farmers to avoid the cooling down of the temperatures around this time that can bring the frost on the plantations. Once this period finished, the frost shouldn't be to fear.
On the 11th of May is celebrated Saint Mamert, on the 12th Saint Pancrace and on the 13th of May Saint Servais. In the calendar they are nowadays replaced by the names Estelle, Achille and Rolande.