thumb|The Secret [[Seal of Solomon]]

The Lesser Key of Solomon, also known by its Latin title Lemegeton Clavicula Salomonis or simply the Lemegeton, is an anonymously authored grimoire on sorcery, mysticism, and magic. It was compiled in the mid-17th century from materials several centuries older.

It is divided into five books: the Ars Goetia, Ars Theurgia-Goetia, Ars Paulina, Ars Almadel, and Ars Notoria. It is derived from the Ancient Greek word () meaning "charm", "witchcraft", or "jugglery".

In medieval and Renaissance Europe, was generally considered evil and heretical, in contrast to (theurgy) and (natural magic), which were sometimes considered more noble. Heinrich Cornelius Agrippa, in his Three Books of Occult Philosophy, writes, "Now the parts of ceremonial magic are goetia and theurgia. Goetia is unfortunate, by the commerces of unclean spirits made up of the rites of wicked curiosities, unlawful charms, and deprecations, and is abandoned and execrated by all laws." The order of the spirits changed between the two, four additional spirits were added to the later work, and one spirit (Pruflas) was omitted. The omission of Pruflas, a mistake that also occurs in an edition of cited in Reginald Scot's The Discovery of Witchcraft, indicates that the could not have been compiled before 1570. Indeed, it appears that the is more dependent upon Scot's translation of Weyer than on Weyer's work in itself. Additionally, some material came from Heinrich Cornelius Agrippa's Three Books of Occult Philosophy, the by pseudo-Pietro d'Abano, and the Magical Calendar.

Weyer's , which is likely related to a 1583 manuscript titled The Office of Spirits, appears to have ultimately been an elaboration on a 15th-century manuscript titled (30 of the 47 spirits are nearly identical to spirits in the ). which were intended to protect the conjurer and to control the demons he summoned. The angelic names and seals derived from a manuscript by Blaise de Vigenère, whose papers were also used by Samuel Liddell MacGregor Mathers (1854–1918) in his works for the Hermetic Order of the Golden Dawn

The seventy-two demons

The 72 [[sigils|thumb|right]]

The demons' names (given below) are taken from the , which differs in terms of number and ranking from the of Weyer. As a result of multiple translations, there are multiple spellings for some of the names, which are given in the articles concerning them. The demons Vassago, Seere, Dantalion, and Andromalius are new additions in that are not present in the that it is based upon. In contrast, the demon Pruflas appears in the but not in .

  1. King Bael
  2. Duke Agares
  3. Prince Vassago
  4. Marquis Samigina
  5. President Marbas
  6. Duke Valefor
  7. Marquis Amon
  8. Duke Barbatos
  9. King Paimon
  10. President Buer
  11. Duke Gusion
  12. Prince Sitri
  13. King Beleth
  14. Marquis Leraje
  15. Duke Eligos
  16. Duke Zepar
  17. Count/President Botis
  18. Duke Bathin
  19. Duke Sallos
  20. King Purson
  21. Count/President Morax
  22. Count/Prince Ipos
  23. Duke Aim
  24. Marquis Naberius
  25. Count/President Glasya-Labolas
  26. Duke Buné
  27. Marquis/Count Ronové
  28. Duke Berith
  29. Duke Astaroth
  30. Marquis Forneus
  31. President Foras
  32. King Asmodeus
  33. Prince/President Gäap
  34. Count Furfur
  35. Marquis Marchosias
  36. Prince Stolas
  37. Marquis Phenex
  38. Count Halphas
  39. President Malphas
  40. Count Räum
  41. Duke Focalor
  42. Duke Vepar
  43. Marquis Sabnock
  44. Marquis Shax
  45. King/Count Viné
  46. Count Bifrons
  47. Duke Vual
  48. President Haagenti
  49. Duke Crocell
  50. Knight Furcas
  51. King Balam
  52. Duke Alloces
  53. President Caim
  54. Duke/Count Murmur
  55. Prince Orobas
  56. Duke Gremory
  57. President Ose
  58. President Amy
  59. Marquis Orias
  60. Duke Vapula
  61. King/President Zagan
  62. President Valac
  63. Marquis Andras
  64. Duke Flauros
  65. Marquis Andrealphus
  66. Marquis Kimaris
  67. Duke Amdusias
  68. King Belial
  69. Marquis Decarabia
  70. Prince Seere
  71. Duke Dantalion
  72. Count Andromalius

A footnote in one variant edition lists the kings of the cardinal directions as Oriens or Uriens, Paymon or Paymonia, Ariton or Egyn, and Amaymon or Amaimon, alternatively known as Samael, Azazel, Azael, and Mahazael (purportedly their preferred rabbinic names). Agrippa's Occult Philosophy lists the kings of the cardinal directions as Urieus (east), Amaymon (south), Paymon (west), and Egin (north); again providing the alternate names Samuel (i.e. Samael), Azazel, Azael, and Mahazuel. The Magical Calendar lists them as Bael, Moymon, Poymon, and Egin, though Peterson notes that some variant editions instead list: "Asmodel in the east, Amaymon in the south, Paymon in the west, and Aegym in the north"; "Oriens, Paymon, Egyn, and Amaymon"; or "Amodeo (king of the east), Paymon (king of the west), Egion (king of the north), and Maimon." Rituals not found in were added, in some ways conflicting with similar rituals found in the and . Most of the spirits summoned are tied to compass points: four emperors are tied to the cardinal points (Carnesiel in the east, Amenadiel in the west, Demoriel in the north, and Caspiel in the south); and sixteen dukes are tied to cardinal points, inter-cardinal points, and additional directions between those. There are eleven "wandering princes", so a total of thirty-one spirit leaders each rule several spirits, up to a few dozen.

Derived from book three of Trithemius's and from portions of the , but purportedly delivered by Paul the Apostle instead of (as claimed by Trithemius) Raziel. Elements from The Magical Calendar, astrological seals by Robert Turner's 1656 translation of Paracelsus's Archdiocese of Magic, and repeated mentions of guns and the year 1641 indicate that this portion was written in the later half of the seventeenth century. Traditions of Paul communicating with heavenly powers are almost as old as Christianity itself, as seen in some interpretations of 2 Corinthians 12:2–4 and the apocryphal Apocalypse of Paul. The is in turn divided into two books, the first detailing twenty-four angels aligned with the twenty-four hours of the day, the second (derived more from the Heptameron) detailing the 360 spirits of the degrees of the zodiac.

The , or The Notory Art, which the Almighty Creator Revealed to Solomon, is a seventeenth-century composite text consisting of two separate and imperfect magical texts, the fourteenth century Ars Notoria, or the Notory Art (glossed version), and the mid-fourteenth century Ars Brevis, or the Short Art. From the original Ars Notoria (glossed version), the compiler of the Ars Notoria, quam Creator Altissimus Salomoni revelavit presents a new rearrangement of a series of mysteriously formulated prayers (which are also found in the London manuscript of The Sworn Book of Honorius) intended to enhance the mental faculties, such as memory, eloquence, and understanding, of the magician. Some editions of the contain the 1657 English translation of The Notory Art, which the Almighty Creator Revealed to Solomon being published and retitled by Robert Turner of Holshott as Ars Notoria: The Notory Art of Solomon, Shewing the Cabalistical Key of Magical Operations, The liberal Sciences, Divine Revelation, and The Art of Memory. Other editions of the Lemegeton omit this work entirely; A. E. Waite ignores it completely when describing the .