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In page Crown jewels:

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A document known as "The Swabian Mirror" or Schwabenspiegel (c. 1275) refers to the installation of the dukes of Carantania and in it mentions a crown of sorts called the "Slovenian Hat" (windischer huot). This crown was placed on the head of the duke during the enthronement ceremony. The crown or hat is described as "a grey Slovenian Hat with a grey cord and four leaves suspended from the brim". In 1358 the Habsburg Duke Rudolf IV imparted coats of arms to those provinces without them and ordered the Slovenian Hat to be placed above the arms of the Slovenian March (later called Lower Carniola and now a province of Slovenia).[citation needed]