In 1817 Angelo Mai edited a further book, from a manuscript in the Biblioteca Ambrosiana at Milan ("Codex Ambrosianus") and later he discovered four more books, in the Vatican Library, none of which were continuations of the eight previously printed, but an independent collection. These are numbered XI to XIV in later editions. Several fragments of oracles taken from the works of Theophilus and Lactantius, printed in the later editions, show that even more Sibylline oracles formerly existed. In the course of the 19th century, better texts also became available for the parts previously published.