Earlier, beginning with Arcesilaus, it had control of the Academy from the 3rd to the 1st century BC, which we know because of its primary ancient source, Sextus Empiricus.  
The founder of the last version of this classical philosophical school was Aenesidemus.  Earlier, beginning with Arcesilaus, it had control of the Academy from the 3rd to the 1st century BC, which we know because of its primary ancient source, Sextus Empiricus.  George Santayana paired it with "Animal Faith" in work that took the views of David Hume, this philosophy's greatest modern exponent, a step further.  FTP, identify this philosophy founded by Pyrrhon of Elis, which has now come to represent a view that doubts what is generally accepted as true.
The founder of the last version of this classical philosophical school was Aenesidemus.  
skepticism or skeptics