The House of Nobility (Swedish: Riddarhuset) in Stockholm, Sweden, is a corporation and a building that maintains records and acts as an interest group on behalf of the Swedish nobility. Name. The name is literally translated as House of Knights, as the knights (Swedish: riddare) belong to the higher ranks of the Swedish nobility, sometimes also together with titles as count (Swedish: Greve) and baron (Swedish: friherre). All esquires are also represented in the corporation (most of the families are so called untitled nobility, Swedish: obetitlad adel).
https://en.wikipedia.org/wiki/House_of_Nobility_(Sweden)