Inspired by the meta question Ban "john" as a tag, as well as this question on the main site, it seems that peter suffers almost (but not quite) as much ambiguity as the john. For this reason I propose the following:
- For all apostles, we use the apostle-foo tag.
- We make foo-apostle a synonym for apostle-foo
- As suggested by Shog's answer we also make foo a synonym for apostle-foo (as opposed to banning foo)
And on a related note, this leaves room to expand a bit on for the suggestion found in Ban "john" as a tag, use full book names when there is a conflict (I think there are only three):