Älvsborg Castle, now generally known as Old Älvsborg, sat on a rocky outcrop on the south bank of the Göta Älv river. During the Middle Ages, this river was Sweden's sole point of access to the North Sea, giving the heights at Klippan immense strategic significance. The castle is first mentioned in written sources during the reign of King Albert (1364-89), though it was most likely built slightly earlier, during the reign of his predecessor Magnus Eriksson.
In 1434, during the Engelbrekt Rebellion against King Erik of Pomerania, the castle was attacked by the rebel leader Engelbrekt Engelbrektsson, but the siege was unsuccessful. In 1436, another rebel army led by Karl Knutsson (Bonde) marched on the fortress, and he persuaded the German castellan Mattias van Kaalen to surrender Älvsborg without a fight. The castle continued to be a focal point of conflict, notably during the Northern Seven Years' War in 1563, when the Danes captured it and razed the surrounding town.
By the 17th century, the castle became vulnerable to modern gunpowder artillery from the nearby Sjöbergen hills. In 1650, it was proposed that the fortress be demolished to prevent its use by invaders. Although it remained in service during the Second Karl Gustav War, the demolition was completed in 1673. Today, some ruins of the castle remain visible near the southern pylon of the Älvsborg Bridge.
Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons
Written by Nik Frost
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