Het Steen is a medieval fortress in the old city centre of Antwerp, Belgium, one of Europe's biggest ports.
The Duchy of Lower Lotharingia was part of the Holy Roman Empire, while on the opposite bank of the Scheldt lay the county of Flanders, which was subordinate to the king of France.
The largest part of the fortress, including dozens of historic houses and the oldest church of the city, was demolished in the 19th century when the quays were straightened to stop the silting up of the Scheldt.
A historical plaque near Het Steen explains that women of the town appealed to Semini when they desired children; the god was reviled by later religious clergy.
A major renovation of Het Steen was completed in October 2021, when it reopened as a visitor center with a modern concrete extension.
[1] Richard Wagner's opera Lohengrin, which premiered in 1850, is set in Antwerp Castle around the year 933 under the reign of Henry the Fowler, with Elsa von Brabant as the main female protagonist and the swan knight Lohengrin, who magically appears on the river on a barge pulled by a swan when the king holds court hearing on the bank.