L'homme armé
The Chigi codex is notable not only for its vivid and colorful illuminations, which were probably done in Ghent in the workshop of the Master of the Hortulus Animae, but also for its very clear and legible musical notation. It contains a nearly complete catalogue of the polyphonic masses by Johannes Ockeghem and a collection of five relatively early L'homme armé mass settings, including Ockeghem's.