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

Libya

Under Article 18, The National Transitional Council is the electoral body responsible for electing the President of Libya. This council consists of members of the local councils throughout the country. (Constitute Project, Libya’s Constitution of 2011 with Amendments through 2012”).

Voting Rights and Suffrage · Country sources (all rights) · Years mentioned: 2011, 2012 · Last edited 2022-12-28 · Edit on GitHub