Roma Sub Rosa is a 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.
Gordianus has a somewhat unusual family structure: his wife, Bethesda, is a former Egyptian slave; his elder adopted son Eco a former deaf-mute who has followed in his father's footsteps as an investigator; his younger adopted son Meto who has estranged himself from his father by becoming a soldier; and his intellectual daughter Diana who has a weakness for well-built but dim-witted men...which is shared, to some extent, by Meto.
Although the RomaSubRosa series is what made him famous, he has also published seven erotic novels under the pen name Aaron Travis-including some set in Ancient Rome (no big surprise there).
He explains it thus: "In Ancient Egypt, the rose was the emblem of the god Horus, later regarded by the Greeks and Romans as the god of silence.
"SUBROSA" (under the rose) has come to mean that which is carried out in secret.