Gaul is a formable nation in Europe, representing a unification of the disparate Gallic tribes from Armorica to Rhaetia, and can be formed by any country in the Gallic or Belgae culture groups with a capital in one of the main Gallic regions. The larger Gallic tribes such as Arvernia, Pictonia, or Aeduia are particularly well-positioned to unite the Gauls, though in principle any Gallic-cultured nation could - even more distant tribes like Insubria or Eraviscia, if they conquer into the area and move their capital. As a tier 3 endgame tag, forming Gaul requires control over all the cities of Gaul as well as reforming into a monarchy or republic and grants claims over all of the traditional Gallic lands, from the tip of Armorica to the Rhine frontier and the heart of Cisalpine Gaul. Historically no state ever came close to unifying the Gallic tribes before the Roman conquest, though elements of Gallic unity could be seen in the uprising of the Arvernian king Vercingetorix and the later Roman breakaway state of the Gallic Empire.
A country's capital must be in one of the hatched territories in order to see the decision to Form Gaul.
The fertile land of Gaul contains many tribes and peoples, living in a prosperous, if tense, relationship. For some, this fractious existence is a sign of the old ways - instead, new methods are needed if our people are to survive in the era of civilization and empire. The task is not light, but perhaps we might be the driving force behind the unification of the Gallic people?
Has at least 1 territory
Country is in the Gallic or Belgae culture group
The capital is in the regions of Celtica, Belgica, Armorica, Aquitania (except for Biggeronia), Transalpine Gaul, or Rhaetia
Add 4 citizen pops, 4 freemen pops, and 4 slave pops to the capital
Capital gets the modifier Center of Civilization until the end of the game, giving:
+0.20% Local Population Growth
+10% Local Civilization Level
+10% Pop Assimilation Speed
+8% Local Freeman Happiness
Get the modifier National Spirit for 7600 days (about 21 years), giving:
+10 Loyalty of Characters
+12% National Citizen Happiness
+12% National Freeman Happiness
Get claims on all unowned provinces in the regions of Aquitania, Armorica, Belgica, Celtica, Transalpine Gaul, and Germania Superior, as well as the provinces of Helvetia, Verbigenia, Alpes Graiae, Transpadana, and Insubria
If the current government form is a monarchy and not Empire or Imperial Cult, set the government form to Empire
Otherwise, gain 300 political influence
If the country is not AI-controlled and the game is ironman, award the achievement The Romans are Crazy
Get 5 free province investments
Formation requirements for Gaul. Fully coloured territories are required, while hatched territories will be claimed after formation.