What is "agathodaemon"

alt. A benevolent spirit as opposed to a cacodemon (an evil daemon). n. A benevolent spirit as opposed to a cacodemon (an evil daemon).

An agathodaemon (, agathodaímōn) or agathos daemon (, agathós daímōn, "noble spirit") was a spirit ( daemon) of the vineyards and grainfields in ancient Greek religion. They were personal companion spirits, comparable to the Roman genii, who ensuring good luck, health, and wisdom.

Agathodaemon (, Agathodaímōn; ) was an alchemist in late Roman Egypt, known only from fragments quoted in medieval alchemical treatises, chiefly the Anepigraphos, which refer to works of his believed to be from the 3rd century. He is primarily remembered for his various descriptions of elements and minerals, most particularly his descriptions of a method of producing silver, and of a substance he had created, which he called a 'fiery poison', and which, judging by his account, was arsenic trioxide, a highly toxic amphoteric oxide.

He described the 'fiery poison' as being formed when a certain mineral (most probably realgar or orpiment) was fused with natron (naturally occurring sodium carbonate), and that dissolved in water to give a clear solution. He also wrote of how, when he placed a fragment of copper into the solution, the copper turned a deep green hue, lending further validity to the suggestion that orpiment or realgar was used, as they are both arsenic ores, and this would be the hue achieved from the copper after it had been placed in the arsenic trioxide had the substance formed been copper arsenite.

Agathodaemon's discoveries exist as part of the foundations for later use of poison, as arsenic and related substances were used regularly in later centuries as means of poisoning and murder. Since the only records of his existence are references in later works, he may be apocryphal, but since the practice of alchemy itself began to decline around the time he is believed to have lived, and it may be that much of his writing was lost. Some of the writings of other alchemists on alchemy of the time were preserved and saved by a sect of dissident Christians, who called themselves Nestorians and who were able to escape to Persia around 400. This information that was gathered by the Nestorians eventually passed on to the Arabs, and this in part contributed to the flourishing of alchemy in that region and in their hands; the modern English word "alchemy" comes from the Arabic language, and many of the foundations for alchemy in Western nations were laid by the Arabs.

An agathodaemon or agathodaimon was a spirit of vineyards and grainfields in the religion of the ancient Greeks.

Agathodaemon or Agathodaimon may also refer to

• Set (deity), the Egyptian god
• The Canopic Branch of the Nile Delta, called the Agathodaemon or Agathodaimon in Ptolemy's Geography
• Agathodaemon (alchemist), the 3rd-century Egyptian alchemist
• Agathodaemon of Alexandria, an Egyptian cartographer of uncertain date connected with Ptolemy's Geography
  • Agathodaemon, a Martian canals named for the cartographer
• Agathodaemon (grammarian), the 5th-century Egyptian grammarian
• Agathodaimon (band), a German band playing death metal
• Agathos Daimon (Forgotten Realms), a fictional deity in the Forgotten Realms campaign setting for Dungeons & Dragons