Roma Sub Rosa is the title of the series of mystery novels by Steven Saylor set in, and populated by, noteworthy denizens of ancient Rome. The series is noted for its historical authenticity. 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.
Read more about Roma Sub Rosa: Characters, Titles