On September 8–11, 1994, the students and colleagues of Joseph F. O'Callaghan presented a colloquium during the annual meeting of the Texas Medieval Association to commemorate his forty years of service at Fordham University. Most of the essays included in this volume were initially presented at the colloquium. Joseph O'Callaghan's friends and colleagues presented a pre-publication copy of the collected essays to him on January 4, 1997, during a reception at the Spanish Institute in New York City.
The editors would like to thank the individuals and organizations that helped with the colloquium and the subsequent volume: Anne Mannion, Anne O'Callaghan, Catherine O'Callaghan, Louis Pascoe S. J., Robert Himmelberg, Teo Ruiz, Robert I. Burns S. J., the Texas Medieval Association, the Hill Monastic Manuscript Library, the American Academy of Research Historians of Medieval Spain, Fordham University, and the Spanish Institute. We also thank Julian Deahl of E. J. Brill for his help and patience.