Ethel, first a language matter:"Hannover" is simply German for "Hanover", just like "Deutschland" is German for "Germany".So you're actually referring to HANOVER.
Just like the U.S., Germany, too, has always been made up of STATES.We're talking here about what was until 1866 the German state of HANOVER (in German: Hannover), the capital of which was the city of HANOVER (in German: Hannover).When talking about Hanover, we're talking about a state covering an area about the same as that covered by the U.S. states of Maryland and Delaware combined.
I will also mention here what was until 1945 Germany's largest state by far, PRUSSIA (in German: Preussen, or if written with the German character "scharfes S", Preußen; pronounced: PROY-s'n), the capital of which was the city of BERLIN.(Following German unification in 1871, Berlin became Germany's national capital as well.)Because of its vast size, Prussia was divided into PROVINCES.
As did most of the major German states, Hanover sided with the German state of Austria against Prussia in the Austro-Prussian War, or Seven Weeks War, of 1866.Austria and her allies were defeated.Prussia thereupon annexed Hanover, which then became what was until 1945 to remain the Prussian province of Hanover.
Following World War II and the break-up of the vast state of Prussia by the Allies, the Prussian province of Hanover, the state of Oldenburg, and the two very small states of Brunswick (in German: Braunschweig) and Schaumburg-Lippe combined to form today's new postwar German state of LOWER SAXONY (in German: Niedersachsen), with the city of HANOVER (in German: Hannover) as its capital.
You mention GLANDORF and LAUDIEK.The hamlet of Laudiek has actually always been administered as part of the town Glandorf.The nearest major city is OSNABRÜCK -- or if written without the "Umlaut" (two dots) over the "U", OSNABRUECK -- in the western part of today's German state of Lower Saxony (Niedersachsen).
You might be interested to know that in the 1830s, a number of families from Glandorf emigrated to America under the leadership of a Catholic priest, Father Johann Wilhelm Horstmann.They founded the village of Glandorf in Putnam County in northwestern Ohio.There, they founded the parish of St. John the Baptist.Glandorf, Ohio, and Glandorf, Germany, are today "sister cities".
As to the surname, Erpenbeck and Erftenbeck both exist in that area of Germany.