According to Gutiérrez Cajaraville (p. 90), this book was commissioned by the Toledo Chapelmaster and composer Bernardino de Ribera in 1569; it was completed in 1570, and Ribera was paid 200 ducats for it.
This beautifully illuminated book ("one of the most stunning visually in the entire Toledo polyphonic corpus" - Stevenson) originally consisted of 159/160 parchment folios, but 25 complete folios have been torn out. It was thought by Noone to have been copied, like many other Toledan mss, by Martín Pérez and illustrated by Francisco de Buitrago; but according to Gutiérrez Cajaraville it is not the work of Perez - died in 1558 - nor (probably) of Buitrago.
This manuscript is the most important source for Bernardino de Ribera's works, most of them are unica, but many are incomplete owing to the missing folios. Only Domine quando veneris, the fabordon on fol. 87v, is not by Ribera - it was added some time after the ms was presented to the Cathedral.