1. As this is an English language Wikipedia, the commonly used name in English is preferred for reasons of clarity: for example, in the (recent) case of Amber Road v. Bernsteinestrasse (qqv), Amber Road is far more transparent to the casual user of Wikipedia. This, of course, may not be possible, particularly when dealing with historical characters.
2. Names of kings and queens. As most monarchical history likely to fetch up in Wikipedia will deal with the English monarchy, and for reasons of concision, kings and queens of England do not require a qualification of nationality; otherwise, the reference should state the nationality of which they were monarch, unless: