The manor has been in the Hellsing family for many years and has been the porsestants main base of opertation against the undead masses of the world. A strong feeling of honour is felt in its halls for only the best of the best can walk them.
The Hellsing manor plays a large part in the Hellsing Manga. Alucard was held captive for many years in it before Integra set him free. it is also the main lunching point of the Millennum Attack when Jan and Luke Valentine launch an Attack on it, forcing Hellsing to hire the Wild Geese to make up for their losses. Also later in the Hellsing manga, Seras Victoria is sent to protect the Manor during the London attack and it was here that we see Seras drink from Captain Pip to become a full vampire.