A watchtower in ceremonial magical tradition is a tutelary spirit of one of the four cardinal points or quarters (East, South, West and North). In many magical traditions, they are understood to be Enochian angels... Originating with the Enochian tradition of John Dee, a version of it was popularized by the Hermetic Order of the Golden Dawn, which became hugely influential in modern Western Esotericism, including Wicca. The watchtowers are invoked during the ritual of casting a magic circle.
The Structure of the Watchtower Hierarchies
Quote: On Wednesday June 20, 1584, Edward Kelly had a vision that would significantly effect the angelic magical system that he and John Dee were receiving. In the days that followed it would be analyzed and explained, and ultimately it would produce the Terrestrial system of Watchtower magic that was to profoundly influence not only their own work but eventually the whole course of the Western Hermetic Tradition.
Coincidence?