> His friend was notable enough to have already been mentioned on Wikipedia. The criteria to have an article about a specific person: there are other articles

> His friend was notable enough to have already been mentioned on Wikipedia. The criteria to have an article about a specific person: there are other articles focusing on that specific person in other publications. The criertia to be mentioned in other contexts on Wikipedia: there are reliable sources that he had a notable role _in that context_. Edit: I think thats a better example: If you climbed a certain mountain as the first person ever: probably you are mentioned on the article about that mountain. If you never did anything else of note, why do you need you own page too? If you are the first person to ever in succession climb all the summits (and others took note of that), you probably have you own article but are not mentioned on every single summits article, maybe on none of them.