The ruins of the later Hohensyburg castle now stand on the site of the Sigiburg. The hillfort is presumably of Saxon origin, but there are no archeological or documentary proofs. During the Saxon Wars, it was taken by the Franks under Charlemagne in 772, retaken by the Saxons (possibly under Widukind) in 774, and taken again and refortified by Charlemagne in 775.
Signal Iduna, Continentale Krankenversicherung, Bundesinnungskrankenkasse Gesundheit (BIG direkt) and Volkswohl Bund. In recent years a service sector and high-tech industry have grown up. Some of its most prominent companies of these sectors include Amprion and RWE-Westnetz (Electricity), Rhenus Logistics (Logistics), Wilo, KHS GmbH, Elmos Semiconductor, ABP Induction Systems, Nordwest Handel AG – all of whom have their headquarters here. Companies with operations in or around Dortmund include Zalando, Daimler AG: EvoBus, RapidMiner, Gap Inc. and ThyssenKrupp. Dortmund is also the headquarter of Century Media Records, a heavy metal record label with offices in the United States and London. In August 2015, Century Media was acquired by Sony Music for US$17 million.  Tourism Cityring Concert, Freedom Square Tourism in Dortmund is a fast-growing economic factor every year: new overnight records can be announced, new hotels open and new visitor magnets are added.
Additional offices in the city centre are used for administrative purposes. The city is the site of several other universities, colleges and academies, which attract about 45, 000 students.  Among them there are: FOM Hochschule für Oekonomie & Management, Standort Dortmund: Academy for management, founded in 1993. Fachhochschule für öffentliche Verwaltung Nordrhein-Westfalen: Academy for public administration. International School of Management: Private academy focussing on management and economics, founded in 1990. IT-Center Dortmund: Private college founded in 2000. International University of Applied Sciences Bad Honnef – Bonn: is a private, state-recognised university of business and management Department of at Design Max-Ophüls-Platz Department of Architecture Research The city has a high density of internationally renowned research institutions, such as the Fraunhofer Society, the Leibniz Association and the Max Planck Society, which are independent of, or only loosely connected to its universities.
(High German: As firm as Dortmund). In the past, the city was called Dortmond in Dutch, Tremonia in Spanish and Trémoigne in Old French. However, these exonyms have fallen into disuse and the city is now internationally known by its German name of Dortmund. The common abbreviation for the name of the city is "DTM", the IATA code for Dortmund Airport. Early history Historical view of the German town of Dortmund by Georg Braun and Franz Hogenberg (between 1572 and 1618) The Sigiburg was a hillfort in the South of present-day Dortmund, overlooking the River Ruhr near its confluence with the River Lenne.
Dortmund is often called the Herzkammer der SPD (roughly translated as "heartland of the Social democrats") after the politically dominant party in the city. During the Nazi era (1933–1945), mayors were installed by the Nazi Party. After World War II, the military government of the British occupation zone installed a new mayor and a municipal constitution modeled on that of British cities. The first major elected by the population of Dortmund was Fritz Henßler. Since the end of the war, the SPD has held a plurality in the city council, except for the period from 1999 to 2004. Mayor Results of the second round of the 2020 mayoral election The current Mayor of Dortmund is Thomas Westphal of the Social Democratic Party (SPD), who was elected in 2020. The most recent mayoral election was held on 13 September 2020, with a runoff held on 27 September, and the results were as follows: Candidate Party First round Second round Votes% Thomas Westphal Social Democratic Party 75, 565 35.
Fortuna Düsseldorf vs. Borussia Dortmund - Football Match Haaland nets 94th minute winner on BVB return. Erling Haaland scored a last minute winner as Borussia Dortmund beat Fortuna Dusseldorf 1-0 on
The Fachhochschule was created by a merger of several institutions of higher learning in 1971. Owing to its history as separate institutions, it consists of three campuses in different parts of Dortmund. The departments of mechanical and electrical engineering are located at Sonnenstraße near the city center. The department of design has its own campus at Max-Ophüls-Platz while the departments of social work, economics, computer science and architecture are housed in several buildings next to the Technical University of Dortmund campus in the suburb of Eichlinghofen.
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The university has a dedicated railroad station at the campus's main gate, the journey from the city center lasting merely seven minutes. The university is highly ranked in terms of its research performance in the areas of physics, electrical engineering, chemistry and economics.  The university's most noticeable landmark is the H-Bahn, a monorail train which connects the north and south campuses. Dortmund University of Applied Sciences and Arts is a Fachhochschule with 12, 300 students, and 669 staff, 232 of which are professors.
Fortuna Düsseldorf vs Borussia Dortmund - Bundesliga Match Fortuna Düsseldorf vs Borussia Dortmund 0:5 in the Bundesliga (1/6/1967): Live score, stream, statistics match & H2H results on