In this collection Gabriel appears as the archangel governing Moon, one of the seven "planets" of pre-modern astronomy (the Sun, Moon, Mercury, Venus, Mars, Jupiter and Saturn). Pairing an archangel with each planet belongs to the tradition of Western ceremonial magic and Christian Kabbalah, where it was set out in works such as Agrippa's Three Books of Occult Philosophy (1533) and the later pseudo-Agrippan Fourth Book of Occult Philosophy, and codified in the Hermetic Order of the Golden Dawn. Several archangels are listed more than once in this collection because they were inherited through three overlapping schemes, planetary, elemental and sephirotic, that Western esotericism never fully reconciled; Gabriel here carries the planetary attribution to Moon. The scheme is presented as a documented esoteric tradition rather than as religious doctrine or as a claim about spiritual beings.
Unlike every other name in this atlas, Gabriel needs no esoteric scheme to establish him: he is one of only two angels named directly in the Hebrew Bible, appearing to Daniel to interpret visions (Daniel 8:16, 9:21), and he carries that canonical standing into the New Testament, announcing both John the Baptist's and Jesus's births to Zechariah and Mary (Luke 1), and into the Quran, where tradition identifies him as the angel, Jibril, who conveyed the revelation to Muhammad. The planetary attribution to the Moon recorded here belongs to the much later Renaissance layer; Gabriel's own scriptural standing owes it nothing.