The Sermons and Liturgy of Saint James: Book I of the ‘Liber Sancti Jacobi,’ edited and translated by Thomas F. Coffey and Maryjane Dunn, Italica Press, 2021 is available as an eBook for W&L students through Leyburn Library.
The introduction to this volume provides an excellent introduction to the Liber Sancti Jacobi. It reviews the origin of the text, previous Christian writings on St. James, his history in Spain and related accounts, the ms. text (Codex Calixtinus), the Liber Sancti Jacobi, its provenance, its authorship, its purpose, and its contents, pp. xiii-xxviii. Subsequently, the introduction focuses on the liturgy and sermons contained in the volume, which you may wish to read.
Of special interest for this course is Chapter 4, which contains the passion of St. James, that is his martyrdom and the divine wrath through which Herod was brought to justice, based on the accounts in the Ecclesiastical History of Eusebius, the Acts of the Apostles and Antiquities of the Jews by Titus Flavius Josephus, pp. 65-69.