not sure. suspect it's subservience to Queen's House of Guelph-Este or relates to Queen's control / covert empire, part of the DS, etc.
this article argues that Queen's bloodline is subordinate to the Black Nobility, FWIW:
https://totaldisclosure.net/secret-societies/the-black-nobility-i/
this is more mainstream:
The House of Hanover (formally known as the House of Brunswick-LĂĽneburg, Hanover line) is a German royal house that came to rule Great Britain. The Hanoverians, as they are known, gained the British throne in the 18 th century, and held on to it until the early 20 th century. During this period, a total of six Hanoverians monarchs ruled Britain, the most famous of whom was probably Queen Victoria.
The House of Hanover is a cadet branch of the German House ofWelf (also known as Guelph),which itself is a branch of the ItalianHouse of Este.This dynasty was created in 1638 as a result of the division of territories of the House of Brunswick-Lüneburg. Initially, the new state was known as the Principality of Brunswick-Calenberg-Göttingen. Later on, however, it was renamed after its principal town, Hanover, which is today the capital of the northwestern German state of Lower Saxony . Thus, the dynasty became known as the House of Hanover. The prestige of the House of Hanover grew as the century progressed. In 1692, in return for lavish promises of assistance to theHabsburgs,Hanover was designated by the Holy Roman Emperor, Leopold I, as the empire’s 9 th electorate.
https://www.ancient-origins.net/history-famous-people/house-hanover-0013792
https://www.zerohedge.com/