What is the oldest written source in this country that mentions this right?

Slovenia

Article 39 of Slovenia’s 1991 Constitution protects press freedom: “Freedom of expression of thought, freedom of speech and public appearance, of the press and other forms of public communication and expression shall be guaranteed" (Constitute Project, “Slovenia’s Constitution of 1991 with Amendments through 2016”).

Freedom of the Press · Country sources (all rights) · Years mentioned: 1991, 2016 · Last edited 2022-12-28 · Edit on GitHub