Formerly known as the "Sulphur Spring", this mineral source is still called so today in the vernacular because of its rather unpleasant taste and smell. Drilled in 1856/57 and later named after the beautiful wife of Landgrave Gustav, the spring (sodium-calcium-chloride-hydrogen-carbonate water) enjoyed great popularity in the 19th century thanks to its healing powers in treating cardiovascular diseases. It was said to be particularly popular amongst Russian spa guests. The spring was originally located “about 100 steps to the left of the avenue" and featured a beautiful superstructure, which took the form of a cast-iron temple with filigree ornamental elements and an imposing dome. In the 1920s, the spring was more and more neglected and finally moved to its present location, in the hollow next to the Landgrafenbrunnen, a move that was instigated by a local spa doctor.
