Culture
Breton
set_culture bretonCulture ID breton. set_culture changes the culture of the character you play; change_culture <county id> breton changes a county's. Both need the debug mode (launch option -debug_mode).

Traditions
The traditions this culture starts with, and what each one does.
Dexterous FishermenSocial+5 Coastal Advantage, +50% Supply Capacity
StorytellersSocial-15% Scheme Secrecy, +5% Legend Spread Chance
Swords for HireWarfare-15% Same Culture Mercenary Hire Cost, +10% Travel Speed, +10% Travel Safety
Chanson de GesteRegional+2 Number of Knights, +5 Negate prowess penalty, +20% Accolade Glory Gain, +5% Legend Spread Chance
Communal ethos
This culture values the bonds of community above all else, fostering great loyalty and dedication by working together towards common goals.
Characters of this culture
Provinces of this culture
- Herders have a higher County Fertility Growth
Martial custom: Men Only
- Only men can be Commanders and Knights
Other Brythonic cultures
Source: game/common/culture/cultures/00_brythonic.txt, game/common/culture/traditions/00_societal_traditions.txt, game/common/culture/traditions/00_combat_traditions.txt, game/common/culture/traditions/00_maa_traditions.txt, game/common/culture/pillars/00_ethos.txt, game/history/provinces (counties at the start) and the English localisation, Crusader Kings III 1.20.0.3.