The Grand Duke Mephistophilis

The Grand Duke Mephistophilis is described in the Black Raven and this is his seal.

The Grand Duke Mephistophilis is the grand master of many arts and of luck in general. He can teach you things in an instant. You
need to summon Mephistophilis four times (if you want good results I guess).

Mephistophilis has quite a selection of spirits under his command who are serving him. Whenever he commands them to serve they do so fast.

Source: Faust’s Black Raven

According to Faust’s Black Raven

The Infernal Kingdom is as follows:

Lucifer (Emperor)

This is the seal of Lucifer from Grimoirium Verum.

“In regard to spirits, there are the superior and the inferior. Names of the superiors are: Lucifer, Beelzebuth, Astaroth. Lucifer appears in the form and figure of a fair boy. When angry, he seems red. There is nothing monstrous about him.”

Source: Grimorium Verum

Belial (Viceroy)

This is the seal of Belial from Goetia.

Belial distributes Presentations and Senatorships, and he also gives good familiars. This demon grants favours of friends and enemies.

Demon Belial must have offerings and gifts from the practitioner. If offerings and gifts are not given to Belial, he will not give true answers and deceive the practitioner.

Source: Goetia

Satan (Governor)

This is the seal of demon Satan from Compendium Rarissimum.

Beelzebub (Governor)

Beelzebub is also the Governor

Some think this is the seal of Beelzebuth. Grimoirium Verum.

Astaroth (Governor)

This is the seal of Astaroth from Goetia.

Astaroth is a duke and he appears in the form of an angel. Astaroth answers truly about issues of the present, past, and to come, and also of all secrets.

He makes a man wonderfully learned in the liberal sciences. Astaroth rules 40 legions of spirits.

Source: Johann Weyer, Pseudomonarchia Daemonum

The seven Grand Dukes of the Infernal Empire:

Aziel

The seal of Aziel from Faust’s Black Raven.

“I am Aziel and I am in charge of all hidden treasures of the Earth. I have the ability to open all treasures and I give them to the one I like…”

Source: The Black Raven

Mephistophilis

This is the seal of Mephistophilis from Faust’s Black Raven.

“I am Mephistophilis and the grand master of many arts and of luck in general. I can teach you things in an instant…”

Source: The Black Raven

So, Mephistophilis is a Grand Duke under Lucifer. You can make pacts with Mephistophilis or do general spells for good luck and more money.

According to the Black Raven the best day of the week to summon Mephistophilis is Monday.

Marbuel

This is the seal of Grand Duke Marbuel from the Black Raven.

“I am willing to serve and I obey. I appear in the shape of a ten year old boy. It is useful to summon me at any time, and I am as fast as an arrow.”

Source: The Black Raven

Ariel

This is the seal of Ariel from the Black Raven.

“I am Ariel and I will help some people, while others I will hurt. I will respond in the manner in which you will have summoned me. I am a stubborn spirit and I will not follow the call of any person.

You must summon me with power before I will appear. I am a ruler over the treasures of all gods.”

Source: The Black Raven

Aziabel

This is the seal of Aziabel from the Black Raven.

“I am Aziabel and I will serve anybody if I am correctly summoned. I am ruler over the affairs of law. Many spirits have to obey me. I also like to please everybody, and I can give honour, riches, status, and a lot of luck.”

Source: The Black Raven

Anifel

This is the seal of Anifel from the Black Raven.

“I could tie and coerce humans”.

Source: The Black Raven

Barbuel

“I am in charge of the seas and over all waters. I rule over everything that lives in water. I may give you everything provided that you summon me right.”

Source: The Black Raven