The result was delete. Spartaz Humbug! 07:01, 13 May 2011 (UTC)[reply]
To quote from the only source for this BLP article: "This is my genealogy page with royal and noble family trees, including lists of rulers of many European countries. [...] Four photos of my son (part 22)". Anyone who doesn't see the problem, see WP:BLPSPS.
The self-published source could easily be replaced by a reliable source, as it doesn't say more than the one line in Debrett's does ("1c HRH Prince CONSTANTINE Alexios of Greece and Denmark, b 29 Oct 1998"). But that's rather pointless, as a single line like this is simply not the basis for notability, or for an article. The purpose of an encyclopedia is to condense information to make it easily digestible, not to make huge pseudo-articles out of basically nothing. The impressive list of godparents (this crowd must have scared the little child like hell) wouldn't help with the notability problem either, even if there were a source for it.
More formally, let me repeat what I said (uncontradicted) about one of his brothers:
He would never get an entry in Britannica or anything like it. At his age he would never even get a separate page in any genealogical work. He completely and utterly fails WP:GNG, and the other notability guidelines are just approximations to GNG whose purpose it is to avoid repetitive discussions in borderline cases. Therefore a notability guideline saying that second generation descendants of kings are automatically notable would be invalid. But it so happens that there is no such specific notability guideline. Let's check the (potentially) applicable parts of WP:BIO:
To all this I could add that he is notable only for one event: his birth. So even if he were otherwise a borderline case, which he isn't, he would at most fall under WP:BLP1E. Hans Adler 20:00, 5 May 2011 (UTC)[reply]
Keep Notable by standing in direct line of succession to the throne of Greece. Whilst I do not think he stands a cat in hell's chance of taking the throne, the family attracts continuing attention. Merging to a single article for the family might be an option, but keep for now. 'Not inherited' does not work for hereditary positions! --AJHingston (talk) 23:03, 5 May 2011 (UTC)[reply]