The place name Haßleben has nothing to do with "negative emotions" and refers to the modified name of an inhabitant in ancient times. Haßleben was first mentioned in a document around the year 780. It seems strange today when you consider that the municipality was an enclave of the County of Schwarzburg-Sondershausen in the High Middle Ages, i.e. surrounded on all sides by foreign territories. However, Haßleben was already inhabited in much earlier times, as evidenced by the gold treasure from the grave of the "Princess of Haßleben" found in the 1920s. It was also astonishing how relatively quickly the community was able to recover from the suffering of the 30-year war, when only 47 inhabitants remained. Just over 150 years later, Haßleben became part of the Duchy of Saxe-Weimar by edict of Napoleon I and already had 1150 inhabitants. The major fire that broke out in 1822 destroyed a large part of the village. It is also due to this tragic event that the typical wide streets of the "Neue Anlage" or "Neustadt" were created during the reconstruction.