I will cover the “King of the East” mentioned in the Goetia, called Amaymon; He rules over more than a few spirits mentioned therein. Before I begin, I must state that if you want more information, watch below video. Now let’s get to it.
Amaymon has told me that He’s an infernal angel and does rule the East, but only from an infernal point of view in general. He’s indeed Saturnian (20° in Aquarius, with strong Piscean traits) and specializes in clairvoyance and to a lesser extent all things in general. Appearance is a tall, transparent figure with yellow eyes and wings (Looks a bit enochian, but He isn’t). For the rest, He’s very gentle and kind, only drawback in working with Him is that He can be demanding, depending on the situation. See below links for (basic) information on Him:
Passage from A dictionary of Angels by G. Davidson:
“Maymon-chief angel of the air, ruler of Saturday, and subject to the South Wind. Three angels minister to Maymon: Abumalith, Assaibi, and Belidet. In de Abano’s works, Maymon is “King of the Saturday angels of the Air.”