The strongest contribution of the French Academies to the public sphere comes from the concours académiques (roughly translated as 'academic contests') they sponsored throughout France. These academic contests were perhaps the most public of any institution during the Enlightenment. The practice of contests dated back to the Middle Ages, and was revived in the mid-17th century. The subject matter had previously been generally religious and/or monarchical, featuring essays, poetry, and painting. By roughly 1725, however, this subject matter had radically expanded and diversified, including "royal propaganda, philosophical battles, and critical ruminations on the social and political institutions of the Old Regime." Topics of public controversy were also discussed such as the theories of Newton and Descartes, the slave trade, women's education, and justice in France.