The collection in question, like that of Dionysius Exiguus on which it is based, contains two parts: the first includes canons of Greek, African, Gallican and Spanish councils, with some letters of St. Cyril of Alexandria and Atticus of Constantinople, while the second has the papal decretals as found in Dionysius, together with some others, most of the latter addressed to Spanish bishops. This is the chronological "Hispana". Somewhat later, towards the end of the seventh century, it was recast in logical order, by some unknown writer, and divided into ten books, which were again subdivided into titles and chapters. This is the methodical "Hispana". Finally, the copyists were wont to place at the beginning of the chronological "Hispana" a table of contents of the methodical collection, but with references to the text of the chronological: in this shape it was known as the "Excerpta Canonum". The chronological "Hispana" seems to have been originally the "Codex Canonum" mentioned at the Fourth Council of Toledo (633), with later additions. In the ninth century it was attributed, with insufficient evidence, to St. Isidore of Seville.