They aren´t supposed to be Philosophers or whatever, but I´ve dug about on the web and found some names, that fit (more or less and just for a bit of fun) to the bods.
The whole gaggle of wisemen...and cleaner
John of Głogów (ca. 1445 – 1507) with a couple of his pupils (maybe Copernicus is one of them ) at the University of Krakow
On the right, William of Moerbeke (1215–c.1286) having a heated discussion with his friend Witelo (c.1230 -1280/?) about Platonic metaphysics.
"NO!! In the book!! Not up there!!" William of Ockham (c. 1288 – c. 1348) in a bit of a row with one of the locals