The Secret Grimoire of Turiel.
The material is contained in the manuscript is a mixture of Christian symbolism, names of power, which invokes the Planetary Archangels, and the Olympic Spirits, and regardless of the origin debate I would not dismiss the manuscripts value in the study of Angelic Magic.
The manuscript appears to detail two rituals. The first to evoke the Archangel of the planet, together with the relevant Olympic Spirit.
The second ritual is the Evocation of the Angel Turiel himself.
Finally, for those that wish to experiment further, I have converted the original manuscript into the equivalent Pauline Art version.