Culture
Frisian
set_culture frisianCulture ID frisian. set_culture changes the culture of the character you play; change_culture <county id> frisian 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.
Stoic ethos
This culture believes in standing strong like a mountain, taking any and all hardships that life may throw at them and enduring them all with grim determination and an indomitable spirit.
Characters of this culture
Provinces of this culture
Martial custom: Men Only
- Only men can be Commanders and Knights
Cultural men-at-arms
Regiments unlocked by innovations only this culture's heritage can research.
- Landsknechts · innovation
Other Central Germanic cultures
Bavarian, Dutch, Franconian, German, Langobard, Saxon, Swabian
Source: game/common/culture/cultures/00_central_germanic.txt, game/common/culture/traditions/00_societal_traditions.txt, game/common/culture/traditions/00_combat_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.