Well, ancient Rome being what it was, it was only a matter of time before Etruria was conquered by the Romans. The Romans, having a healthy respect for divination and its usefulness to those in power, brought both the religious text, which they came to call the Etrusca Disciplina and the haruspicers (diviners who divined by examining the livers of newly-deceased victims) with them back to Rome.
The Etrusca Disciplina was translated from the Etruscan language into Latin by a Roman of Etruscan descent named Publius Nigilius Figulus. Figulus was a statesman and scholar who lived in the first century B.C.E. and appears to have been well-regarded by his contemporaries. He even counted Cicero, notorious critic of diviners, as a personal friend, so highly-regarded was he as a scholar. His translation of Tages’ brontoscopic calendar was translated into the Greek language around six hundred years later by a man known as John the Lydian. No copies of the Etrusca Disciplina in the original Etruscan language are known to exist. Somewhere along the way, they were either disappeared or crumbled to dust. John the Lydian’s translation was translated into English by Jean MacIntosh Turfa, and it is Dr. Turfa’s translation I’m using for this brontoscopic calendar.
The origin-myth of Tages himself, who appears to have lived around 2800 years ago, was so ridiculous, I decided another one of my Yes-and-No Stones investigations was needed to clear away the nonsense. Tages’ origin myth states he sprang a fully-formed toddler from a furrow ploughed by an Etruscan farmer and immediately started spouting wisdom so impressive, adult Etruscans gathered ‘round to listen. Please.