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

Dominica

Article 1(c) of the only constitution Dominica has had, written in 1978, protects the right to privacy in the home. Article 7(1) protects privacy during a search (Constitute Project, "Dominica 1978 rev. 2014").

https://constituteproject.org/constitution/Dominica_2014?lang=en

Privacy Rights · Country sources (all rights) · Years mentioned: 1978, 2014 · Last edited 2022-12-28 · Edit on GitHub