The Hermetic Order of the Golden Dawn was founded in London in 1888 by three Freemasons with deep esoteric knowledge: William Wynn Westcott, Samuel Liddell Mathers and William Robert Woodman. The founding mythology centred on a cipher manuscript — allegedly discovered by Westcott and decoded to reveal a system of magical grades — and correspondence with a purported German Rosicrucian adept, Fräulein Sprengel, who supposedly authorised the founding of an English temple.
The Sprengel correspondence was almost certainly fabricated by Westcott — a forgery discovered in 1900 that contributed to the order's collapse. But the system built on this foundation was entirely genuine. Mathers in particular was an extraordinary synthesiser: he drew on the Hermetic Kabbalah, the Tarot, Renaissance magical texts (Agrippa, Dee), Egyptian religion, Freemasonic ritual and contemporary occultism to create an integrated initiatory curriculum that had no precedent.
The order was organised into two tiers: the Outer Order (three grades: Neophyte, Zelator, Theoricus, Practicus, Philosophus) teaching the theoretical framework of the Western magical tradition, and the Inner Order (the Rosae Rubeae et Aureae Crucis — the RR et AC) in which actual magical practice was taught. Advancement through the grades required passing examinations in Kabbalah, astrology, Tarot, geomancy and ritual.