In 1557 Primož Trubar wrote that the spring started with the feast of the Chair of Peter according to Julian calendar. On this very feast in 1834 France Prešeren published his Crown of Sonnets with a tripartite acrostic PRIMICOVI JULJI P counting 15 letters and corresponding to the middle column 9+ 5 + 1 of a 3-order magic square. As there are just 8 ways in which the samesum 15 can be made, the acrostic may refer on Trubar's year of birth 1508, too.
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