Numa

They did not burn his body, because, as it is said, he forbade it; but they made two stone coffins and buried them under the Janiculum. One of these held his body, and the other the sacred books which he had written out with his own hand, as the Greek lawgivers their tablets. But since, while he was still living, he had taught the priests the written contents of the books, and had inculcated in their hearts the scope and meaning of them all, he commanded that they should be buried with his body, convinced that such mysteries ought not to be entrusted to the care of lifeless documents.

This is the reason, we are told, why the Pythagoreans also do not entrust their precepts to writing, but implant the memory and practice of them in living disciples worthy to receive them. And when their treatment of the abstruse and mysterious processes of geometry had been divulged to a certain unworthy person, they said the gods threatened to punish such lawlessness and impiety with some signal and wide-spread calamity.

Therefore we may well be indulgent with those who are eager to prove, on the basis of so many resemblances between them, that Numa was acquainted with Pythagoras. Antias, however, writes that it was twelve pontifical books, and twelve others of Greek philosophy, which were placed in the coffin. And about four hundred years afterwards, when Publius Cornelius and Marcus Baebius were consuls, heavy rains fell, and the torrent of water tore away the earth and dislodged the coffins.