First, let us talk about the Coligny Calendar.

The Coligny Calendar, found in Coligny, Ain, France in 1897, is a great treasure. Much debate is spent on when the calendar starts its months and years. It is one of the few things we have found that the Gauls left behind. When the month’s fall is somewhat constant. Twelve months appear every year, and out of every five years, the first and third year have a thirteenth, intercalary month.

The typical twelve months are as follows:

Samonios (May-June)

Dumanios (June-July)

Riuros (July-August)

Anagantios (August-September)

Ogronios (September-October)

Cutios (October-November)

Giamonios (November-December)

Simiuisonna (December-January)

Equos (January-February)

Elembiuos (February-March)

Aedrinios (March-April)

Cantlos (April-May)

(Some start the year with Samonios in November-December.)

The intercalary months are:

Quimonios (before Samonios in the first year of a five year cycle)

Rantaranos (before Giamonios in the third year of a five year cycle)

The months are divided into halves. The first half is 15 days, the second either 15 or 14. This is because of months alternate between 30 and 29 days. The months start in the first quarter moon, centering the full and new moons in each half. (Some say it starts at the new moon.) The years repeat in a cycle every five years. Again, much debate surrounds the calendar. A workable synopsis is all that can reasonably be provided in such an introduction.

Here is an excellent read on the Coligny Calendar over at Tegos Skrībbātous


Holidays are significant in a looser, variant customs like Galatîbessus. In the sense that they have the potential to bring folks of many disparate customs together. Much as we see in other customs. Though, with many other things in Galatîbessus, there is no universal set of holidays people observe. To cover them, all would be exhaustive. Here is a sampling of a full set of holidays that uses the Coligny Calendar to determine the dates. The names of all but one are not named on the calendar.

Holidays are assumed by clusters of days, lasting about a week, and single days. These days, on the calendar, are marked with the term “IVOS,” thought to mean “feast, festival.” Again, the holidays are recent as we do not know what they were initially called. Save for one: Trinoxtion Samoni.

Here is a list of holidays based on the “IVOS” clusters on the Coligny Calendar. However, one does not need to know the Coligny Calendar to celebrate the holidays. To provide a context so that one will always know when the holidays are, solstices, equinoxes, and lunar phases will be used as references. The holidays are as follows:

These are some of the holidays within Gaulish Polytheism.

Bessus Nouiogalation

  • Nouiobledanî “New Year”
  • This will be the first quarter moon, usually in the Gregorian month of May. Sometimes it will be in June.
    • Gregorian Date – Sundown 28 May – 29 May
  • Trinoxtion Samoni (“Three Nights of Summer”)
  • It always starts on 17 Samonios. Usually, the third-quarter moon closest to the summer solstice. If the closest third quarter moon is more than a week after the summer solstice, go with the third quarter moon before it.
    • Gregorian Date – 14 – 16 June
  • Cerdâlitus (“Crafter Feast”)
  • The third-quarter moon before the first quarter moon is two first quarters after the summer solstice. Always the third quarter before the next holiday, Centumetâs.
    • Gregorian Date – 10 – 17 July
  • Centumethâs “First Harvest”
  • Two first quarters after the Summer Solstice.
    • Gregorian Date – 25 – 29 July
  • Catu Alessiâs “Battle of Alessia”
  •  Third-quarter moon closest to the autumn equinox. Always 17 Ogronios.
    • Gregorian Date – 10 October
  • Centugiamos “Start of Winter”
  • Two first-quarter moons before the winter solstice
    • Gregorian Date – 21 – 27 October
  • Giamolitus “Winter Feast”
  • The full moon closest to the winter solstice.
    • Gregorian Date – 30 December
  • Biuiacolanos “Quickening”
  • Two first-quarter moons after the winter solstice.
    • Gregorian Date – 15 – 22 February
  • Uisonnalitus “Spring Feast”
  • Just after the new moon closest to the spring equinox.
    •  Gregorian Date – 13 April
  • Centusamos “Start of Summer”
  • Centusamos two first-quarter moons before the summer solstice.
    • Gregorian Date – 16 – 20 May
  • Samolitus “Summer Festival”
  • Samolitus first quarter moon before the summer solstice
    • Gregorian Date – 25 May – 1 June

Find out more about these holidays above over at Bessus Nouiogalation. 

The above Gregorian Dates will change every year. The dates listed above are for roughly mid 2020CE – mid 2021CE

Also, here is an awesome Coligny Calendar app to go with the above Holidays

Coligny Calendar app

  Segomaros Widugeni

  •  Trinouxs Samoni “Three Nights of Samonios”
    • The new moon nearest November 1, or the night after the full moon nearest November 1.
    • Associated Deities: Sucellus, Nantosuelta, the Ancestors, Cernunnos, and Maponus.
  • Iwos Dumanni “The Festival Of Dummanios”
    • The new moon nearest December 1, or else the full moon nearest the Winter Solstice.
    • Associated Deities: Epona, Cernunnos, Maponus, the Anderoi (to be propitiated, not worshipped, the Dusioi (ditto).
  • Iwos Brigantias “The Festival Of Brigantia”
    • The new moon nearest May 1.
    • Associated Deities: Brigantia.
  • Iwos Lugous “Festival Of Lugus”
    • The new moon nearest August 1.
    • Associated Deities: Lugus, Rosemerta.

 Above is Segomaros Widugeni version; you can find more about these Holidays in his book Ancient Fire on pages 96-108.

Senobessus Bolgon

  • Îuos Altrauonon
    • Veneration to gods connected to vegetation and harvests are given. Gregorian Calendar: July 2nd-3rd
  • Îuos Borui Arduinnasc/Îuos Grannui Sironasc
    • This holiday honors the gods associated with the sun/light, stars/moon, and youth. Gregorian Calendar: July 16th-18th
  • Îuos Maguseni
    • This last festival is dedicated to Magusenos/Magusanus. During this time, we continue to honor Him with athletic contests, music, and dance. Gregorian Calendar: August 1st-3rd
  • Giamounox (Winter Night)
  • A time when the dead and the wild hunt or sacred company roam and expect to be propitiated. Henceforth the holiday will be known as Winter Night or Giamounoxtion – Winter Nights.
    • 30th of October – 1st of November
  • Giamouretîmâ (Winter Releasing)
    • On the day of the Equinox or full moon after the Equinox, an effigy of Nehalennia is burnt and sent to a body of water to release Her so she may bring spring and summer.

To find out more about the above Holidays, check out Senobessus Bolgon.

Carnutian Nemeton

  • Ducospiâ Carnutonon (Rebellion of the Carnutians)

    This minor Îuoi is about uprising about standing for what you believe in and remembering the Carntus for their great sacrifice in the face of the coming Empire. This is celebrated on Elembi 9.

To Find out more about this Îuoi, checkout The Carnutian Nemeton.