Gauss … [had] a salary that remained fixed from 1807 to 1824.
(see here.) What was Gauss’ salary? My limited google skills were not able to find this information, although I’m not sure how meaningful it would be to translate any such number into today’s dollars. More generally, although there is available data for academic salaries over the past 40 years or so, I’m curious for comparisons that go further back in time.