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

Mauritius

The sole constitution of Mauritius from 1968 is limited in what it says about privacy rights. It only protects a person and their property from a search in Article 9 (Constitute Project, "Mauritius 1968 rev. 2016").

https://www.constituteproject.org/constitution/Mauritius_2016?lang=en

Privacy Rights · Country sources (all rights) · Years mentioned: 1968, 2016 · Last edited 2022-12-28 · Edit on GitHub