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

Senegal

Senegal does not explicitly protect the right to privacy in its constitution. Article 7 of the 2001 constitution makes the claim to protect human rights but does not call out privacy. Article 13 provides for private correspondence and Article 16 makes the domicile inviolable (Constitute Project, “Senegal 2001 rev. 2016”).

https://constituteproject.org/constitution/Senegal_2016?lang=en

Privacy Rights · Country sources (all rights) · Years mentioned: 2001, 2016 · Last edited 2022-12-28 · Edit on GitHub