STELLAS DAEMONUM offers an in-depth analysis of the spirits that appear in several late medieval and early modern grimoires. The book unravels these texts' mythical, etymological, magical, and religious meanings, and draws out their astrological correspondences. The author shows how the spirit entities featured in these Goetic grimoires can be best understood by studying the celestial nature apparent in the ancient concept of the daimon and through an extensive study of 93 of spirits featured in medieval and renaissance texts. The book also explores how traditional Judeo-Christian religion ultimately demonised such expressions due to their polytheistic roots and made punishable by death any attempts to reconnect with them. The nature of this work is strongly influenced by the author's own magical practices, but its presentation does not resort to subjective or personal experiences, having a style that is more formal and research-based.