Although European history is one glorious muddle, I think it does help if one can get a few lines sorted out. Hannover was never under
English (or British rule). At the end of the 18th century we got very fed up with Catholic kings and sent James II (son of Charles II) packing. However he had two sisters, Mary and Anne who were Protestant so the throne passed to Mary who was married to William,
Prince of
Orange (
Dutch) who was not keen on being his wife's subordinate so they became joint monarchs. They died without heirs so the throne passed to Anne, married to
Prince Charles of Denmark who had no ambition but to be his wife's husband. Despite endless miscarriages and about 11 living children, Anne outlived all her children, so when she died (1714) we were once again left facing Catholic heirs, the descendants of James, Charles (The Old Pretender) and Charles Edward (Bonnie
Prince charlie, The Young Pretender). Not wanting them we turned to the next Protestant heir, a long way down the line, who was George, Elector of
Braunschweig (
Brunswick). He took the throne and reigned until 1727 but had little interest in
England or
English legislation and never learnt to speak
English. He was folowed by three more
Georges, William and Victoria all with very Germanic connections. Victoria married yet another
German and spoke
German as her home language.
Ferris is quite a common name and I would guess either of
Irish or Scottish origin but there are no Ferrises in the telephone book for
Hannover. I think the more likely explanation is that your family were in some sort of trade, of which there was a lot, and that your ancestor just happened to be born there because his parents were there at the time. It is just possible that there could be a record of foreign residents in
Hannover at that time so why not write to the City authorities and ask? Hope this helps.