Logically the Zwanenbroedershuis is the house of the Zwanenbroeders. But what are the Zwanenbroeders (loosely translated to Swan Brethren)?
It’s a society of an old brotherhood that was originally started to honor the virgin Mary, but is nowadays a brotherhood for high-ranking individuals. For example, the Dutch King Willem-Alexander is one of its members.
The name originates from the habit of serving many dishes containing swans during the annual banquet. The building, in Neo-Gothic style, is partially opened as museum and therefor open to visitors during guided tours.