Libri fatales

The prophesies of the brothers Marcius were added by the Senate to the Sibylline books circa 212 B.C.E.

In 83 B.C.E. Sulla marched on Rome and the temple of Juppiter O.M was burned and reportedly the entire original Sibylline books. Plut. Sulla 2.7.6. Dion. Hal. 4.62.5-6. After Sulla the Senate established a commission in 76 B.C.E. to gather prophesies for the new collection of Sibylline Books. The comissioners went to the East but omitted Cumae, home of the Cumaean Sibyl. 1,000 lines came from Samos.

References

Takacs, "Vestal Virgins, Sibyls and Matrons"