The paper is based on the document kept by the Archives of the Republic of Slovenia in its archival fond AS 38,
Carniolan Provincial Diet and Committee. The introductory part of the article provides a summary of how provincial and
national colours of the Carniolan coat of arms and flag developed through time and is followed by the central part in which the
author focuses attention on the event in 1916, when the hanging of the gold-blue-red flags from some of the buildings in
Ljubljana during the celebration of the 50th anniversary of the victory at Custozza provoked a strong reaction of the
Provincial Committee. Having received a number of written complaints by the members of the Committee, the Ministry of the
Interior issued a decree granting the Carniolan Provincial Estates and their Successors, i.e. Provincial Diet and Committee,
the exclusive right to use the old provincial colours of gold-blue-red and prohibiting private owners from doing so.