Question: In which country is the Dreieckiger Pfahl and the former Kingdom of Hanover?
Sentence (from "Kingdom of Hanover"): The kingdom was ruled by the House of Hanover, a younger branch of the House of Welf, in personal union with the United Kingdom of Great Britain and Ireland until 1837, before being conquered by Prussia in 1866 and transformed into a Prussian province.
Relevant evidence: No