Mardero: A demon of disease who has the power to afflict his victims with terrible fever. He is one of thirty-six demons associated with the decans of the zodiac whose names are listed in the Testament Aside from some flourishes, the seal of the demon Marchosias remains the same in various editions of the Goetia of Solomon. Although Mardero is a fearsome entity, appearing with the body of a man and the head of a beast, he can nevertheless be driven off simply by invoking the names Sphener and Rafael.
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SOURCE:
The Dictionary of Demons written by Michelle Belanger.
NOTE:
Edited and revised for the Web by Occult Media, the 23rd of April 2021. We use British English spelling.