Amateur: identify from reference, know acts
Authority: know if living or dead, know location, key abilities and resources, retell detailed myths
Expert: identify associates, recognize heroic traits
Sage: sense accomplishments in the bearing of others, location or destination of a hero’s soul upon death
Recognizing a hero’s name from a reference about something someone did is simply, “Ah, that was so-and-so.” Knowing an act does not mean knowing the whole tale; Hercules killed the lernean hydra. How? That requires an authority.
Knowing the present location of a hero means only generally; the location where a hero will go upon death, or where a dead hero has gone (Elysium, Heaven, Happy Hunting Grounds) is a deeper, more profound knowledge. Key abilities would be what a hero was able to do, or what resources (magic items) they possessed. Associates are living people who aided or knew the hero, if that is possible—it wouldn’t be if the hero were long dead.
Recognizing heroic traits in others would be knowing from communication that an individual’s ability, or level perhaps, was far in excess of appearance. Sensing accomplishments does not give details about what was done, only that the individual has clearly mastered something great (if they have), though that may not have been made known.
Amateur: empires, wars
Authority: biographies of great figures, events, regions
Expert: biographies of lesser figures, cultures, diplomacy, trends
Sage: conspiracies, plots, subversive diplomacy
History is not limited to times long past—even something that happened last week is still ‘history.’ The lesser historian may be consigned to details, persons or moments of change, but the greater historian begins to see sweeping trends (which would be what regions seem to have meant to do, or are meaning to do) or even be aware of conspiracies that lie behind the visage of what everyone else sees.
I expect this study, and what can be known at what level, to evolve considerably as the study is employed.
Law & Customs
Amateur: civil laws, local criminal laws
Authority: capital crimes, cultural moralisms and practices
Expert: business law, property law, tariffs, taxes, trade
Sage: jurisprudence, precedents, settlement making
Knowing local criminal laws are those that typically pertain to the lowest class, and presuppose the character having had time to investigate ... ie., a day or two. Civil laws are those regarding assault, minor destruction of property, slander, etc.
Capital crimes are more widely distributed, and are those for which death, amputation or an imprisonment of years is involved—which vary in detail according to how heavy is the penalty and how action is affected by religion or morality.
Business law et al allows a useful knowledge of the right amount to pay, the right palms to grease, the right manner of setting up a business, or knowing where and the means to obtain permits, etc.
Jurisprudence is to argue the meaning and scope of the law itself, why it was created or how it came to be. Precedents allows a court trial to be dismissed or reduced to a lesser crime, something that would probably require a wisdom check to invoke (half wisdom or less to suspend, wisdom to reduce sentence, failure of check to have no effect on trial). Settlement making would be the cleric having the wherewithal to settle a dispute amicably between others simply on the basis of knowing how others in the past have faced a similar quandary.