Ragnhildsborg, also known as Tälje hus, is a medieval castle situated on Slottsholmen in Linasundet, north of Södertälje in Södermanland. Between 1434 and 1436, Engelbrekt Engelbrektsson and Karl Knutsson (Bonde) led an uprising against the Kalmar Union and Erik av Pommern. During this time, bailiffs were driven from their castles, which were then burned. Eventually, Erik Puke, one of Engelbrekt’s closest men, set Tälje hus on fire.
In 1448, Karl Knutsson (Bonde) was appointed to the throne and began rebuilding a castle on Slottsholmen, naming it Karlsborg. This new fortress lost much of its importance during the late 1400s and was abandoned. By the early 1500s, Tälje hus was described as 'omkullfallen'.
Today, the site comprises the ruins of a stone house, a house foundation, and several terraces and ditches. Although the name Ragnhildsborg is associated with Södertälje’s patron saint Ragnhild of Tälje, the name is not medieval and has been known since the 1700s.
Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons
Written by Nik Frost
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