(demon Mammon from a 16th century occult manuscript)

In the Talmud and in the New Testament the word mammon signifies property, both money and possessions, but it is sometimes personified into a god or demon. "No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one and despise the other. Ye cannot serve God and mammon" (Matthew 6:24). It was a common practice of Kabbalists and Christian magicians to extract the names of angels from functions described in Scripture, so it was no great leap to create the demon Mammon from its biblical context. Mammon is the demon of wealth and avarice.

The visonary nun Saint Francisca (1384-1440) ranked Mammon as one of the three princes of hell, subordinate only to Lucifer. "The first of these is Asmodeus, once a cherub, but now holding the 'principality' of carnal sins. The next is Mammon, the demon of avarice who holds the 'throne' of this world. The third is Beelzebub, who holds the 'dominion' of idolaters. These three powers and Lucifer never leave their prisons, except under special permission from God; but they have legions and legions of subordinates on earth who are responsible to them."