Deborah it's great you have taken on adding profiles for all the Popes to WikiTree, but sorry I take a really hard line when it comes to pre-1500 profiles and maybe you will get a more temperate view from other people.
But because there are already too many pre-1500 profiles that have poor sources or no sources and because I think those of us who are given permission to undertake work on pre-1500 profiles have a much greater responsibility for the health of WikiTree, I personally think we should never create a pre-1500 profile just based on unsourced online genealogies.
I do realise that for most of us, myself included, if we want to work on a profile for someone from a non-English speaking background that Wikipedia is the ideal place to start, though I would encourage the use of the Wikipedia article in the language of the person. Most web browsers have an inbuilt translation function these days and they are often better sourced.
For instance the Italian version of the Wikipedia article for her son Sixtus IV has an article (again in Italian) that looks really well-sourced and does state that Luchina Monleone is his mother and also has details about siblings, including some extra sisters not mentioned in the online genealogies.
While I'm still on my soapbox I realise it isn't well-known, but every Wikipedia article has a Cite this page function (under Tools on the right of the screen) and it's really easy to just copy and paste the Chicago style, which is the WikiTree recommended one.
OK off the soapbox.