friherre Jöns Jakob Berzelius

Born in Sweden in 1779, Jöns Jacob Berzelius became one of the most influential chemists of the 19th century. He studied medicine, taught chemistry, and built a reputation for careful experiments and exact measurements at a time when the science was changing rapidly.

Berzelius is especially remembered for improving the system of chemical notation, using letter-based symbols that made formulas easier to read and share. He also carried out major work on atomic weights and helped identify or isolate several elements, including silicon, selenium, thorium, and cerium.

Beyond the lab, he was a leading scientific figure in Sweden and was later made a baron, which fits the "friherre" title in your query. He died in 1848, but his influence still shows up every time chemistry students read the symbols for the elements.