[4] Granius was used as a source on ancient Roman religion by the Church Fathers; Arnobius, for instance, refers to him as many as five times[5] in his books Contra Paganos, second in number only to Varro, equal to the famed Pythagorean scholar Nigidius Figulus, and more often than Cicero.
[7] He shared the view of Varro that the res divinae for both Apollo and Father Liber were celebrated on Mount Parnassus.
Granius is cited as an authority in the Digest of Justinian, where he is said to have written a book on Papirian law (Ius Papirianum) as ascribed to the 6th-century BC pontifex Papirius.
[10] Granius[11] recorded, for instance, that Numa Pompilius, in founding religious rites for the Romans, struck a deal with the gods to punish those who committed perjury.
[12] It may be that no collection of leges regiae existed earlier, and the idea that there was a ius Papirianum originated with the work of Granius at the beginning of Augustus' reign.