Butler. An English name assumed by an adept, a disciple of some Eastern Sages, of whom many fanciful stories are current. It is said for instance, that Butler was captured during his travels in 1629, and sold into captivity. He became the slave of an Arabian philosopher, a great alchemist, and finally escaped, robbing his Master of a large quantity of red powder. According to more trustworthy records, only the last portion of this story is true. Adepts who can be robbed without knowing it would be unworthy of the name. Butler or rather the person who assumed this name, robbed his “Master” (whose free disciple he was) of the secret of transmutation, and abused of his knowledge—i.e., sought to turn it to his personal profit, but was speedily punished for it. After performing many wonderful cures by means of his “stone (i.e., the occult knowledge of an initiated adept), and producing extraordinary phenomena, to some of which Val Helmont, the famous Occultist and Rosicrucian, was witness, not for the benefit of men but his own vain glory, Butler was imprisoned in the Castle of Viloord, in Flanders, and passed almost the whole of his life in confinement. He lost his powers and died miserable and unknown. Such is the fate of every Occultist who abuses his power or desecrates the sacred science.
Source: H.P.Blavatsky - The Theosophical Glossary