Any idea as to when he went from 'Maximilian Chevalier v. Paumgartten' to 'Maximilian Freiherr von Paumgartten'?
1809: Chevalier:
https://books.google.com/books?id=zL8DAAAAMAAJ&pg=PA662
Freiherr:
https://books.google.com/books?id=mPUEAAAAMAAJ&pg=PA13