Occultism in the Court of Elizabeth I
Pretty sure this relates to the famous Alchemist, John Dee.
John Dee was the advisor and tutor to Queen Elizabeth I.
John Dee created this magical sigil (below) called "Sigillum Dei Aemeth" (aka, Seal of God). With it he believed he could decipher the names of all the arch-angels.
With this magical symbol, Dee and his magick partner Edward Kelley, would summon and communicate with angelic inter-dimensional beings. At first the two alchemist believed that the beings they were summoning, and communing with were a