First lets talk about the Coligny Calendar

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

The normal 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 at 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 in halves, the first half is 15 days, the second either 15 or 14. This is because 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.) They 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 a great read on the Coligny Calendar over at Tegos Skrībbātous


Holidays are very important in looser, variant customs like Gaulish Polytheism. 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 Gaulish Polytheism, there isn’t a 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. On the calendar, these days are marked with the term “IVOS”, thought to mean “feast, festival”. So, again, names of the holidays are recent as we don’t know what they were originally called. Save for one: Trinoxtion Samoni.

Here’s 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”)
    • 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”)
    • Third quarter moon before the first quarter moon that 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”
    • 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 a 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 propitated, 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

Bessus Noricon

  • Īuos Comtegisom // Festival of Unification
    • A practitioner may actively partake in helping the world transition a little further from chaos into peace. A time of transition. The 16th day of Riuros
  • Īuos Sedati // Festival of Sedatos
    • A day of service, not of work. the day should be spent doing craftsmanship of some sort by the light of a candle.
      Celebrated on the last day of Cutios.

To find out more about the above holidays check out Bessus Noricon
Also these Holidays use the Coligny Calenar app
This is also the maker of the Coligny App.