Foriano Pico, an Italian guitarist and composer, is the subject of some controversy. His book, Nuova scelta di sonate per la chitarra spagnola, contains works that are attributed to Pietro Millioni and is commonly dated 1628 or 1608.
There are some, however, who feel that neither of those dates are correct. Instead, Pico’s book was published in 1698.
The two extand copies of Nuova scelta (both incomplete) are held at Biblioteca Nazionale Vittorio Emanuelle III in Naples, Italy and Bibliothèque Nationale de France in Paris. There is a good overview of the contents of the book here.