Nowadays Gerolstein is famous for its mineral springs and its bottled mineral water. It is the biggest mineral water exporter in Germany.
The name ‘Gerolstein’ appeared first in connection with the Löwenburg Castle in 1115. The castle was erected by a certain Gerhard von Blankenheim, and that’s why it was also called Gerhardstein. It is assumed that the name Gerolstein derived from Gerhardstein.