* Oppose multiple names is one thing, English vs. original language name is another. Regardless on whenever some authors may prefer to use a name in another language, if there is an established and recognized English usage (and in this case, there is) that's the one that should be used. As for consistency, if there are Portuguese monarchs with their name in English and others in Portuguese, we may very well consider consistency in the other way, translating the Portuguese monarchs to their English forms; that would be consistent with the French, Spanish and German monarchs as pointed by Uxbona. The mere usage of Portuguese names within Portuguese monarchs articles right now does not mean a consensus on the topic, same as the long usage of the English name here did not mean so either; as Lecen pointed, we talk about neglected articles.