The motto originates as that of the Order of Saint Hubert of the Dukes of Jülich and Berg, rendered in 15th-century Lower Franconian as in traw vast.
The order was defunct during the 17th century, and revived in 1708 under Johann Wilhelm, by which time the Duchy of Jülich-Berg had passed to the Palatinate branch of the House of Wittelsbach.
[1] During the First World War, the motto was frequently reproduced on postcards and other memorabilia, often with the portraits of emperors Wilhelm II and Franz Joseph I.
The "fidelity" invoked in the motto was now interpreted as referring to the loyalty of the German Empire and Austria-Hungary to their alliance of 1879 in view of the increasing political isolation of the Central Powers on the eve of the Great War.
[3] Because of its association with monarchism, the motto unlike other German military slogans (notably the term Nibelungentreue) remained unassociated with Nazi ideology and is still in use by a number of German associations, including Tambourcorps "In Treue fest" (Anstel, founded 1919/20),[4] Neusser Tambourkorps "In Treue fest" (Neuss, founded 1968).