[Sergius]

I only know it from my school years. It is, now that I give it some thought, the only Christian holy day that is being marked in Danish public schools, apart from Christmas and Easter that are marked almost exclusively with non-Christian traditions (Julemanden/Santa Claus, egg-colouring, etc.). And the only Saint that is widely celebrated in Denmark, I think. Anyway, it's more of a Winter Solstice celebration than anything else, but still it is called Saint Lucia.