The statutes of the medieval period were authorised by the University itself and recorded by the Proctors. The earliest collection of statutes in the University Archives formed the Old Proctors' Book (or 'Vetera Fragmenta') which was made about 1390. Some of the folios of this book were later removed and rebound in the Junior Proctor's Book. The early statutes were added to from time to time until 1570 when the great Elizabethan code of statutes became the new foundation of University government. This code, and subsequent ones, derive their authority from the Crown, and in their turn were added to and interpreted until the next complete revisions in 1858 and 1882. The latest wholesale revision of statutes was in 1926. The most notable printed eiditons of the unreformed statutes are those of 1785 and 1852. The statutes produced under the act of 1877 were published in 1882, and since then there have been frequent new editions, with supplements published between editions, of the statutes and ordinances.