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

Mauritania

Article 13(4) protects the right to privacy in Mauritania: “The honor and the private life of the citizen, the inviolability of the human person, of his domicile and of his correspondence are guaranteed by the State” (Constitute Project, "Mauritania 1991 rev. 2012").

https://www.constituteproject.org/constitution/Mauritania_2012?lang=en

Privacy Rights · Country sources (all rights) · Years mentioned: 1991, 2012 · Last edited 2022-12-28 · Edit on GitHub