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

Dominica

After its independence from the United Kingdom in 1979, the Commonwealth of Dominica adopted its Constitution, which had been written the year prior. Article 9 deals with “Protection of conscience” and protects freedom of religion (Dominica 1978).

Dominica. 1978 “Dominica 1978 (rev. 2014)” Constitute Project https://www.constituteproject.org/constitution/Dominica_2014

Freedom of Religion · Country sources (all rights) · Last edited 2023-08-04 · Edit on GitHub