The linked article is not well referenced, but it does have an lot of detail dates.
Again a nice timeline but not really great references for scholarly purposes.
I was trying to find out when images (paintings, photographs, etc.) were first eligible for copyright protections. Maybe some of this is set through case-law.
In addition to this question, a second question exists: when was copyright and the public domain established?
Tyler T. Ochoa, Origins and Meanings of the Public Domain , 28 U. Dayton L. Rev. 215 (2002),
Available at: https://digitalcommons.law.scu.edu/facpubs/80
Ashton Williams, Shockingly Evil: The Cruel Invasive Appropriation and Exploitation of Victims' Rights of Publicity in the True Crime Genre, 27 J. Intell. Prop. L. 303 (2020).
Available at: https://digitalcommons.law.uga.edu/jipl/vol27/iss2/6
Peter K. Yu, Ten Common Questions about Intellectual Property and Human Rights, 23 Ga. St. U.L. Rev. 709 (2007).
Available at: https://scholarship.law.tamu.edu/facscholar/386