The Hermetic Order of the Golden Dawn was a magical order founded in 1888. Its teachings focussed on the Qabalah, Hermeticism, astrology, tarot, alchemy – albeit through the lens of Theosophy. In its higher grades (the “inner order”) members passed from the theoretical to the practical and practiced ceremonial magic.
Notable members included S L MacGregor Mathers, Aleister Crowley, W B Yeats, Dion Fortune, A E Waite, Paul Foster Case, as well as a whole host of others.
“The Golden Dawn,” by Israel Regardie
In 1934, Israel Regardie went public with the teachings of The Golden Dawn, although many of them had been published previously by Crowley.
The original order broke up and stopped operating under the name of “Golden Dawn” in the early twentieth century, but there are nowadays modern revivals of the Golden Dawn, operating in England, America, and elsewhere.
Source: Alex Sumner’s answer to Occult: What is the Hermetic Order of the Golden Dawn? – Quora
Sol Ascendans - The Website of Alex Sumner 
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