General Information
Deira is playable from 410 to 604, and from 616 to 654. In 654, Deira is annexed by 
Northumberland.
See also: England, Bernicia, Wessex, Essex, East Anglia, Lindsey, Mercia, Northumberland, Kent
Strategy
Decisions
Form Wales (410-559)
Requirements:
- Is not:
Wales does not exist- At peace
- Primary culture is Welsh and
- Owns 2 core provinces in the Wales area or
- Owns 4 core provinces in the British Isles region
Upon Enactment:
- Country changes to Wales
- Gain 25 Prestige
- Gain a permanent claim on all Welsh and Briton provinces in the British Isles region
- Gain country modifier Increased Centralization for 20 years:
- -0.05 Monthly Autonomy Change
- +1 National unrest
- -0.05
- If an HRE member and not an elector or, all own provinces are removed from the Empire.
Form England (559-604, 616-654)
Requirements:
- Is not:
- Great Britain does not exist
- At peace
- Owns core province: London, Oxfordshire, Wessex , Kent, and Essex
Upon Enactment:
- Country changes to England
- Capital moves to London (236)
- Gain 25 Prestige
- Gain a permanent claim on the Northern England, Mercia, East Anglia, Wales, and Wessex areas
- Gain country modifier Increased Centralization for 20 years:
- -0.05 Monthly Autonomy Change
- +1 National unrest
- -0.05
- If an HRE member and not an elector, leave the empire.
- Gain English Traditions & Ambitions.
Form Great Britain
Requirements:
- This country:
- Primary Culture is in the British Culture Group, Welsh, Highlander, Anglo-Saxon, or Briton
- Is not:
- Great Britain does not exist
- Administrative Technology is at least 55
- Is not a Subject Nation
- Is not a Nomad Nation
- At Peace
- Owns core province: London (236), Oxfordshire (237), Wessex (234), Lothian (248), Aberdeen (251)
Upon Enactment:
- Country changes to Great Britain
- Gain 25 Prestige
- Gain permanent claim to the British Isles region
- If Duchy, then set government rank to Kingdom.
- If an HRE member and not an elector or emperor, all provinces are removed from the empire.
- Capital moves to London (236)
- Gain country modifier Increased Centralization for 20 years:
- -0.05 Monthly Autonomy Change
- +1 National Unrest
- -0.05
Form Deira
Requirements:
- Is not:
- Deira does not exist
- Is nota subject nation
- Is not in the Gaelic culture group
- Capital is Lancashire (244) or Yorkshire (245)
- At peace
Upon Enactment:
- Country changes to Deira
- Gain 10 Prestige
- If primary culture is in the Scandinavian or Germanic group, then primary culture becomes Anglo-Saxon
- Gain country modifier Increased Centralization for 20 years:
- -0.05 Monthly Autonomy Change
- +1 National Unrest
- -0.05
Welsh Ideas and Traditions (410-559)
Traditions:
- +1 Attrition for Enemies
- +10% Morale of Armies
Ideas:
- Cynulliad: -20% Stability Cost Modifier
- Bardic Literature: +1 Yearly Prestige
- Cyfraith Hywel: -1 National Unrest
- Unbennaeth Prydain: +1 Yearly Legitimacy
- Economic Revival: +10% Production Efficiency
- Prifysgolion Cymru: -10% Idea Cost
- Welsh Church: +1 Tolerance of the True Faith & +1% Missionary Strength vs. Heretics
Ambitions:
- +25% Land Force Limit Modifier
Anglo-Saxon Ideas and Traditions (559-654)
Traditions:
- +1 Attrition for Enemies
- +10% Morale of Armies
Ideas:
- Burhs: +20% Fort Defense
- Anglo-Saxon Settlement: -10% Culture Conversion Cost
- Law of Æthelberht: -10% Stability Cost Modifier
- Treaty of Wedmore: +1 Yearly Prestige
- Fyrd: -10% Infantry Cost
- Tribal Hidage: +10% National Tax Modifier
- Heptarchy: +25% Hostile Core-Creation Cost
Ambitions:
- +20% Manpower Recovery Speed