It was during his stay in Asia (20 B.C.) that the Parthian king Phraates voluntarily restored the Roman prisoners and standards taken at Carrhae (53 B.C.), a welcome tribute to the respect inspired by Augustus, and a happy augury for the future.
He wrote a work on augury, the first book of which he dedicated to Cicero.
Troops in this victory were a good augury for the future.
The latter is said to have appealed to augury to determine the exact site of his projected foundation; but less fantastic considerations went far to settle it.
The science of augury was contained in various written works, which were consulted as occasion arose: such were the libri augurum, a manual of augural ritual, and the commentarii augurum, a collection of decrees or answers given by the college to the senate in certain definite cases.