Source of Miracles
The Codex Calixtinus is a manuscript that is the main witness for the 12th-century Liber Sancti Jacobi, a pseudepigraph attributed to Pope Calixtus II. The principal author or compiler of the Liber is thus referred to as "Pseudo-Calixtus", but is often identified with the French scholar Aymeric Picaud. Its most likely period of compilation is 1138–1145.