Arguing against the position of Kurfess (Oracula Sibyllina I/II, ZNW 40 (1941), 151-165), L. sees the author of Books I-II unequivocally as a Christian of the second century AD (150), basing her terminus post quem on her revivification and expansion of the thesis of M.R. James that sees Books I-II (but especially II) as particularly indebted to the Apocalypse of Peter.