Freedom of Expression/History/Noteworthy written sources
Is there another noteworthy written source from the past that mentions this right?
This right is mentioned in several historical noteworthy written sources, some of which include John Locke's extremely influential and fundamental Second Treatise of Government. Along that same vein, noted philosophers have written commentaries on laws, freedoms, and political theory; these include works by Michael Foucault, particularly in his lecture series at Berkeley, Montesquieu in his commentary the Spirit of the Laws, Sir William Blackstone's Commentaries on the Laws of England, and John Stuart Mill's noteworthy work On Liberty.
Many international treaties, charters, and conventions also work to avidly incorporate the freedom of expression in its foundations. The UN International Covenant on Civil and Political Rights, the European Convention on Human Rights, the American Convention on Human Rights, the African Charter on Human and Peoples’ Rights, and the EU Charter of Fundamental Rights.
References:
John Locke, Second Treatise of Government