In ancient Rome, the quindecimviri sacris faciundis were the fifteen (quindecim) members of a college (collegium) with priestly duties.
They guarded the Sibylline Books,[1][2][3] scriptures which they consulted and interpreted at the request of the Senate.
[5] Originally these duties had been performed by duumviri (or duoviri), two men of patrician status.
[6][7] Their number was increased to ten by the Licinian-Sextian Law in 367 BC, which also required for half of the priests to be plebeian.
[9] At some point in the third century BC, several priesthoods, probably including the quindecimviri, began to be elected through the voting tribes.