variations on the melody of "Wilhelmus van Nassouwe" is that by the blind carillon-player Jacob van Eyck in his mid-17th century collection of variations Der Fluyten Lust-hof. The 10-year old Wolfgang Amadeus Mozart composed in 1766, while visiting Holland, a set of 7 variations for keyboard in D major on the song, now listed as K. 25. Richard Strauss wrote his "Variationen über 'Wilhelm von Oraniên'" for military band in 1892. The manuscript which, it seems, was mislaid, is in the Koninklijke Collecties in the Hague. There is a recording available on YouTube by the Band of the Netherlands Royal Marines. The royal anthem of Luxembourg (called "De Wilhelmus") is a variation on the Wilhelmus. The melody was first used in Luxembourg (at the time in personal union with the Kingdom of the United Netherlands) on the occasion of the visit of the Dutch King and Grand Duke of Luxembourg William III in 1883. Later, the anthem was played for Grand Duke Adolph of Luxembourg along with the national anthem. The melody is very similar, but not identical to that of the "Wilhelmus". It is in official use since 1919. The song "Wenn alle untreu werden" (German: "If everyone becomes unfaithful") better known as "Das Treuelied", which was written by the poet Max von Schenkendorf (1783–1817) used exactly the same melody as the "Wilhelmus". After the First World War this became extremely popular among German nationalist groups. It became one of the most popular songs of the SS, together with the Horst Wessel song. The melody is also used in the Swedish folksong "" ("Alas, Gothic kingdom"), written down in 1626. The song deals with the liberation struggle of Sweden under Gustav Vasa in the 16th century. Lyrics The "Wilhelmus" was first printed in a , literally "Beggars' songbook" in 1581. It used the following text as an introduction to the "Wilhelmus": {| class="wikitable" | |A new Christian song made in the honour of the most noble lord, lord William Prince of Orange, count of Nassau, Pater Patriae (Father of the Nation), my merciful prince and lord. [A song] of which the first capital letter of each stanza form the name of his merciful prince. To the melody of Chartres. |} Original Dutch (1568) Acrostic Contemporary Dutch Official translation William of Nassau, scion Of a Dutch and ancient line, I dedicate undying Faith to this land of mine. A prince