Agathodaemon

Agathodaemon created his 'fiery poison' by fusing a mineral (probably realgar (seen here) or orpiment) with natron. 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,

Agathodaemon's discoveries exist as part of the foundations for the later use of poison, as arsenic and related substances were used regularly in later centuries as a 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, it may be that much of his writing was lost.