Sömmerda is a town near Erfurt in Thuringia, Germany, on the Unstrut river. It is the capital of the district of Sömmerda. Archeological digs i…Sömmerda is a town near Erfurt in Thuringia, Germany, on the Unstrut river. It is the capital of the district of Sömmerda. Archeological digs in the area that is now Sömmerda, formerly Leubingen, have uncovered prominently buried human remains dating to around 2000 BCE. One such burial of an individual, dubbed the "king of Leubingen" is the Leubingen tumulus.