Trondheim (Norwegian pronunciation: [ˈtrɔnhæɪm]), historically Kaupangen, Nidaros and Trondhjem, is a city andmunicipality in Sør-Trøndelag county, Norway. It has a population of 187,353 (January 1, 2016), and is the third most populous municipality in Norway, although the fourth largest urban area. It is the third largest city in the country, with a population (2013) of 169,972 inhabitants within the city borders. The city functions as the administrative centre of Sør-Trøndelag county. Trondheim lies on the south shore of the Trondheimsfjord at the mouth of the river Nidelva. The city is dominated by the Norwegian University of Science and Technology (NTNU), the Foundation for Scientific and Industrial Research (SINTEF), St. Olavs University Hospital and other technology-oriented institutions. The settlement was founded in 997 as a trading post, and it served as the capital of Norway during the Viking Age until 1217. From 1152 to 1537, the city was the seat of the Catholic Archdiocese of Nidaros; since then, it has remained the seat of the Lutheran Diocese of Nidaros and the Nidaros Cathedral. It was incorporated in 1838. The current municipality dates from 1964, when Trondheim merged with Byneset, Leinstrand, Strinda and Tiller.
Trondheim was named Kaupangen (English: market place or trading place) by Viking King Olav Tryggvason in 997. Shortly thereafter it came to be called Nidaros. In the beginning it was frequently used as a military retainer (Old Norse: "hird"-man) of King Olav I. It was frequently used as the seat of the king, and was the capital of Norway until 1217.
People have been living in the region for thousands of years as evidenced by the rock carvings in central Norway, the Nøstvet and Lihult cultures and the Corded Ware culture. In ancient times, the Kings of Norway were hailed at Øretinget in Trondheim, the place for the assembly of all free men by the mouth of the river Nidelva. Harald Fairhair (865–933) was hailed as the king here, as was his son, Haakon I, called 'the Good'. The battle of Kalvskinnet took place in Trondheim in 1179: King Sverre Sigurdsson and his Birkebeiner warriors were victorious against Erling Skakke (a rival to the throne). Some scholars believe that the famous Lewis chessmen, 12th-century chess pieces carved from walrus ivory found in the Hebrides and now at the British Museum, may have been made in Trondheim.
Trondheim was the seat of the (Catholic) Archdiocese of Nidaros for Norway from 1152. Due to the introduction of Lutheran Protestantism in 1537, the last Archbishop, Olav Engelbrektsson, had to flee from the city to the Netherlands, where he died in present-day Lier, Belgium.
The city has experienced several major fires. Since much of the city was made of wooden buildings, many of the fires caused severe damage. Great fires ravaged the city in 1598, 1651, 1681, 1708, twice in 1717, 1742, 1788, 1841 and 1842; however, these were only the worst cases and there have been several smaller fires in the city. The 1651 fire destroyed 90% of all buildings within the city limits. The fire in 1681 (the "Horneman Fire") led to an almost total reconstruction of the city, overseen by General Johan Caspar von Cicignon, originally from Luxembourg. Broad avenues like Munkegaten were created, with no regard for property rights, in order to stop the next fire. At the time, the city had a population of roughly 8000 inhabitants. After the Treaty of Roskilde on 26 February 1658, Trondheim and the rest of Trøndelag, became Swedish territory for a brief period, but the area was reconquered 10 months later. The conflict was finally settled by the Treaty of Copenhagen on 27 May 1660. City Map of Trondheim in 1898, Norwegian edition During World War II, Trondheim was occupied by Nazi Germany from 9 April 1940, the first day of the invasion of Norway, until the end of the war in Europe, 8 May 1945. The home of the most notorious Norwegian Gestapo agent, Henry Rinnan, was in Trondheim.
The city and its citizens were also subject to harsh treatment by the occupying powers, including imposition of martial law in October 1942. During this time the Germans turned the city and its environs into a major base for submarines (which included building the large submarine base and bunker DORA I), and also contemplated a scheme to build a new city for 300,000 inhabitants, Nordstern ("Northern Star"), centred 15 kilometres (9 miles) southwest of Trondheim, near the wetlands of Øysand in the outskirts of Melhus municipality. This new metropolis was to be accompanied by a massively expanded version of the already existing naval base, which was intended to become the primary future stronghold of the German Kriegsmarine. Today, there are few physical remains of this enormous construction project.
References of text and photo: Wikipedia