Magister Jacobus de Ispania, Author of the Speculum musicae

The Speculum musicae of the early fourteenth century is by a long way the largest medieval treatise on music. For nearly a century, its author has been known as Jacques de Liège or Jacobus Leodiensis. ’Jacobus’ is certain, fixed by an acrostic declared within the text; Liège is hypothetical, based on evidence shown here to be less than secure. New