The first list in the volume bears the title: _Catalogus librorum jampridem per sanctum officium Inquisitionis reprobatorum_. This is followed by the Latin lists of the Louvain Index, with the anonymous works alphabeted in, and a supplement with eleven further titles. This Valdes Index is the first of the Spanish series, and forms the foundation of the Index of 1559. Llorente mentions[116] an Index prepared in 1555 under the instructions of the Inquisition, but states that this was kept in the form of manuscript for the use only of the inquisitors. Valdes was concerned with the compilation of two further Indexes, those of 1554 and 1559. The supplement to the lists of 1551 presents certain general prohibitions; such as of Bibles in Spanish or in any vernacular versions; (these are entered curiously under the letter “N,” “New and Old Testaments”); pictures, figures or statues by means of which the Virgin or the Saints might be brought into ridicule; all books tainted with heresy (_sapiento haeresim_); works having to do with necromancy; books (whatsoever their text) which had been printed within twenty-five years, and which failed to present the name and address of the printer. A separate prohibition is provided for books written against the proceedings of the Diet of Ratisbon (1541). This is directed against a monograph by Calvin, published anonymously, in which this Diet is sharply handled. The lists report the authors given in the Louvain Index, in some instances with fresh errors (“Bronzins” for “Brentius”). The new names include Michael Servetus (his first appearance in any Index), connected with his tract on the Trinity; Simon Essius, for Simon Hessus, connected with his _Apologia_; John Fisher, Bishop of Rochester (possibly the earliest English author prohibited outside of England); Ulrich von Hutten, _libri omnes_ (Hutten, while not listed in Louvain, had been recorded by Casa); Alcoranus _vel alii libri in arabigo ubi sunt errores sectae Mahometicae_ (this is the first appearance in an Index of Arabic heresy). As late as 1790, the _Koran_, in every version, finds place in the Spanish Index, while there is a special prohibition of the Latin translation of the same that had been made in the 12th century by Peter of Cluny, and had been printed, _cum refutationibus variorum_, in Basel in 1543. In the Index of Quiroga, the _Koran_ appears under the title _Machumetis ... ejusque successorum vitae ac doctrina ipseque Alcoran ... adjunctae sunt confutationes multorum una cum M. Lutheri praemonitione_, etc. Reusch points out that this prohibition has to do not with the doctrines of the _Koran_ but with the godless (_impia_) undertakings of the publisher, Theodor Bibliander of Basel. In the Index of Clement VIII, the entry appears, _Instructionum et rituum sectae Mahometanae libri omnes_. Since Benedict XIV, the prohibition comes under the general decree I, 11.