Who was the greatest of the german artists and a scholar, scientist, and mathemetican

The greatest of the German artists and a scholar, scientist, and mathematician is: Athanasius Kircher, S.J.  (1601 or 1602 – 1680) (sometimes erroneously spelled Kirchner) was a 17th-century German Jesuit scholar and polymath who published around 40 major works, most notably in the fields of Oriental studies, geology, and medicine. Kircher has been compared to fellow Jesuit Roger Boscovich and to Leonardo da Vinci for his enormous range of interests, and has been honored with the title "Master of a Hundred Arts". A resurgence of interest in Kircher has occurred within the scholarly community in recent decades. 

The answer is cave paintings

Iwould recommend the attic