This category works on a broad definition of nobility, including ruling houses of true monarchies, peerage or equivalents and lower aristocracy or gentry. Please note that this page is unlikely ever to list all 'noble' titles discussed in Wikipedia, since quite some derived/related titles (especially for descendants, as discussed in Prince) and translations (some more may be found via the equivalent categories in other language-Wikipedias) are only discussed in a (sub)section, not on a page of their own.