Introduction, Angus MacKay and the history of Later Medieval Spain / Roger Collins -- Bibliography of Angus MacKay's contributions to the subject / Anthony Goodman -- Continuity and loss in medieval Spanish culture : the evidence of MS Silos, archivo monโastico 4 / Roger Collins -- Traitors to the faith? : Christian mercenaries in al-Andalus and the Maghreb, c.1100-1300 / Simon Barton -- Jews and Moors in the Siete partidas of Alfonso X the Learned : a background perspective / Robert I. Burns -- Trading with the 'other' : economic exchanges between Muslims, Jews, and Christians in late medieval northern Castile / Teofilo F. Ruiz