Roma Sub Rosa is a series of historical mystery novels by Steven Saylor set in ancient Rome and therefore populated by famous historic roman citizens. The phrase "Roma Sub Rosa" means, in Latin, "Rome under the rose." If a matter was sub rosa, "under the rose," it meant that such matter was confidential. The detective is known as Gordianus the Finder, and he mixes with non-fictional citizens of the Republic including Sulla, Cicero, Marcus Crassus, Catilina, Catullus, Pompey, Julius Caesar, and Mark Antony. Source: Wikipedia (en)