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| Jonadab | 29. a |
| Joram | 29. a |
| Joel | 29. a |
| Joseph | 28. d |
| Josiah | 77. c |
| Jehoshaphat | 29. a |
| Josephus on the Pasch | 54. a |
| Josephus on the fourteenth moon | 71. b |
| Josiah | 76. a & 29. a |
| Jovinian, Emperor | 83. b |
| Jovian | 29. d |
| Joram | 77. a |
| Jonathan, Pontiff | 79. d |
| Jehoshaphat | 76. d |
| Irenaeus | 81. c |
| Nighttime rainbow | 16. a |
| How a rainbow is formed | 15. d |
| Isaac, the first to be circumcised | 75. d |
| Isaac | 28. d |
| Ishmael | 28. d |
| The Jubilee is instituted by Pope Boniface | 91. a |
| Judith | 29. a |
| Jews in Spain receive the faith of Christ | 29. d |
| Jews into Egypt | 79. c |
| Judges from Moses to Samuel | 28. d |
| Two signs of the Last Judgment | 95. b |
| Kingdom of the Jews overturned | 81. a |
| Julian | 81. c & 29. d |
| Julius Caesar | 29. a |
| July | 41. d |
| July, formerly Quintilis | 26. b |
| Julian, Emperor | 83. b |
| Julius Africanus | 82. a |
| June | 41. c |
| Juno Moneta | 41. c |
| Jupiter the wanderer | 79. c |
| Jupiter, the same as the sun | 35. b |
| Jupiter | 6. c |
| Jupiter, the bright one | 10. b |
| Justinian, Emperor | 29. d & 86. d |
| Justin the philosopher | 81. c |
| Justin, Emperor | 29. d & 85. a |
| Justinian restores the privileges of the church | 87. a |
| Justinian, nephew of Emperor Justin | 85. a |
| Justin the Younger, Emperor | 86. c |
| Justin the Younger, an exile | 86. c |
| Lacedaemon is founded | 28. d |
| Various opinions among the ancients concerning the Milky Way | 10. d |
| What the Milky Way is | 10. |
| Son of Lagus | 29. a |
| Lamech | 74. d |
| Laodicea | 79. b |
| Latitude of the globe | 57. c |
| Leander of Seville | 85. b |
| Ledon, a species of marine tide | 17. c |
| Why the Lion is fervent | 44. d |
| Leo, son of Constantine | 88. a |
| Leo, Emperor | 84. c & 87. b & 29 |
| Leonora, wife of Frederick | 92. a |
| Sedition of the Leodians people of Liège | 91. d |
| Leonides | 81. d |
| Leo | 10. c & 29 |
| Libs southwest wind | 14. c |
| Libra | 10. c |
| Lida, the sixth and seventh month of the English | 43. c |
| Livy | 28. d |
| Heliacal line | 10. a |
| Latin language is manifold | 75. b |
| Letters first invented | 28. d |
| One unskilled in letters is not admitted to the election of an Emperor | 91. c |
| Lombards ravage Italy | 85. b |
| Lothair, Emperor | 90. a |
| The kingdom is divided among the sons of Lothair | 88. d |
| Lothair | 88. d |
| The relics of Stephen the Protomartyr are revealed to Lucian | 84. a |
| Lucian the presbyter | 85. a |
| The bones of Luke are carried to Constantinople | 82. b |
| Lucretius on thunder | 15. b |
| Lucifer the shining one | 10. b |
| Louis, son of Arnulf, Emperor | 89. b |
| Louis the Stammerer | 88. d |
| Louis, son of Lothair | 89. c |
| Louis, Emperor, a despiser of the Roman see | 91. b |
| Louis the Pious is crowned by Paschasius | 88. d |
| To find the moon's age on Paschal holidays | 98. b |
| The moon is highest in the North | 51. a |
| That the moon is seen most quickly in the sign of Aries | 65. b |
| At the moon's eclipse, bodies are rendered empty | 52. b |
| Abdon | 76. b & 28. d |
| Kingdom of the Lacedaemonians | 28. d |