 Studies on the history of skepticism before the modern period are not restricted to Pyrrhonism and Academic skepticism. It should not go unmentioned Maurício Pagotto Marsola’s paper (Brazil) (2007) on Plotinus and skepticism, for this is a very unexpected aspect of Plotinus’ philosophy. In connection to the origins of Medieval Philosophy, and especially Augustine and Descartes, Luis Bacigalupo (Peru) (1999) has also done some research. Rodrigo Pinto de Brito (Brazil) (2015) has been working on the impact of skepticism in Christian thought.