User:Afil raised a question in private that should be address in public.
Who do we call popes? At the moment, we have entries under their family name, and entries under their adopted name.
For women, there is a clear rule: Use the maiden name. This makes genealogical sense as it connects families. It can be confusing, because many women are much better known by their husband's name.
For noble men, the rules are not clear, but we typically use the highest title achieved. Igor of Kiev was born as Igor of Novgorod.
There is thus a precedent for both Bruno von Worms and Gregory V. I think the former makes more sense, but the latter is better known -- so in this case the data are with Bruno and Gregory redirects.
Others may disagree. rtol 05:33, May 20, 2011 (UTC)