Born at 15th century the German alchemist H. C. Agrippa wrote De Occulta Philosophia libri III, an interpretation of ethereal beings where he integrates occult lore of the natural world with Christianity, which remained as a reference and source for later and modern occultist traditions.

In his writings Agrippa cites Thomas Aquinas, ancient philosophers, scholars and religious books as references for his reasoning and quotations. In this manner he widely provides a united background overkabbalistic magic and Neoplatonic philosophy, and considers the wisdom inserted in the harmonies of nature as means to man achieve his greatest potential.^[157][158] Arising from those investigations Agrippa distinguishes three kinds of ethereal planes: