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

Latvia

Article 100 of Latvia’s 1922 Constitution protects press freedom: “Everyone has the right to freedom of expression, which includes the right to freely receive, keep and distribute information and to express his or her views. Censorship is prohibited" (Constitute Project, “Latvia’s Constitution of 1992, reinstated in 1991, with Amendments through 2016”).

Freedom of the Press · Country sources (all rights) · Years mentioned: 1922, 1991, 1992, 2016 · Last edited 2022-12-28 · Edit on GitHub