Eisenach (ˈaɪzənax) is a town in Thuringia, Germany with 42,000 inhabitants, located west of Erfurt, southeast of Kassel and northeast of Frankfurt. It is the main urban centre of western Thuringia and bordering northeastern Hessian regions, situated near the former Inner German border. A major attraction is Wartburg castle, which has been a UNESCO World Heritage Site since 1999.
Eisenach was an early capital of Thuringia in the 12th and 13th centuries. St. Elizabeth lived at the court of the Ludowingians here between 1211 and 1228. Later, Martin Luther came to Eisenach and translated the Bible into German. In 1685, Johann Sebastian Bach was born here. During the early modern period, Eisenach was a residence of the Ernestine Wettins and was visited by numerous representatives of Weimar classicism like Johann Wolfgang Goethe. In 1869, the SDAP, one of the two precursors of the Social Democratic Party of Germany (SPD) was founded in Eisenach.
Car production is an important industry in Eisenach. The Automobilwerk Eisenach was founded in 1896. In the German Democratic Republic, the Wartburg was produced here, before the factory was acquired by Opel in 1990.
Eisenach is situated on the Hörsel river, a tributary of the Werra between the Thuringian Forest in the south, the Hainich mountains in the north-east and the East Hesse Highlands in the north-west. Since January 2021, it is part of the Wartburgkreis.
Eisenach's origin and early history is unknown. An 8th century Frankish settlement near Petersberg hill is regarded as the nucleus of Eisenach. However, there are no written sources about that early period. According to legend, Louis the Springer began in 1067 to establish Wartburg castle above the settlement.
In 1080, the castle was first mentioned in a Saxon chronicle. Eisenach itself followed in a document dating to 1150 where it was referred to as "Isinacha". During the 1180s, the town was established by the construction of three independent market settlements around the Saturday's market (today's Karlsplatz), the Wednesday's market (today's Frauenplan) and the Monday's market (today's Marktplatz).