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File:Fatimid regency.png

Power sharing where the diarch has full powers

Power sharing occurs when a significant amount of power is delegated to a second character, called the diarch, who helps their liege run their realm but may also use the power for their own gain.

Mandates

During the power sharing, the diarch will be tasked with a mandate to pursue while the liege is unavailable. There are three possible mandates and their effects:

Mandate	Possible benefits	Apptitude	Description
Fill Coffers	Extra gold Free domain development Feudal contracts adjusted in the liege's favor	+1 per  Stewardship +0.5 per  Intrigue +0.5 per  Learning	The Diarch is instructed to increase revenues for their Liege, at any cost.
Swell Armies	Positive men-at-arms modifiers Positive levy modifiers Skilled knight courtiers	+1 per  Martial +0.5 per  Prowess +0.5 per  Diplomacy	Current or future campaigns call for fresh bodies to fight, and the Liege has decreed that their Diarch shall find them.
Promote Authority	Characters leave factions Increased crown authority Increased council opinion	+1 per  Diplomacy +0.5 per  Martial +0.5 per  Learning	The Liege calls on their Diarch to help build and focus the power of the throne.

The diarch will receive events related to these mandates and be given the option to grant the benefit to their liege, split rewards, pocket it for themselves, or just ignore their duties entirely. Their aptitude will influence how good they are at doing their job.

Loyalty

Each diarch has a loyalty rating, which determines how likely they are to abuse their powers.

• Selfless diarchs will not use borrowed powers and always give the mandate benefits to the liege. If the liege tries to end the power sharing they will always agree.
• Situational diarchs will sometimes use borrowed powers and always split the mandate benefits with the liege or ignore their duties. If the liege tries to end the power sharing but the Scales of Power are not at level 1 it will require paying the diarch with something.
• Self-Interested diarchs will try to use borrowed powers and always pocket the mandate benefits themselves. If the liege tries to end the power sharing but the Scales of Power favor them they will always refuse.

Loyalty is increased by positive  Opinion,  Dread, and the diarch's Compassion and Honor. It will always be Selfless if the ruler has a Loyalty or Loyalty to Predecessor  strong hook on the diarch.

Scales of Power ​

The Scales of Power go from 0 to 100 and represents the balance of the power shared between liege and diarch. The longer the power sharing lasts the more it increases towards the diarch, giving them more power in the realm. Barring other factors, Scales of Power tend to drift to 50. Both liege and diarch may try to swing the Scales of Power in their favor every 2 years via the following options:

Option	Cost
	Count	Duke	King and  Emperor
Leverage Influence			100
Leverage Prestige	75	150	350
Leverage Piety	50	100	250
Leverage Gold	100	300	750
Ask for intercession from your Head of Faith	50 100	100 300	250 750
Use a Hook

Asking for intercession from the Head of Faith is only available if both characters have the same head of faith and the character requesting it has at least 60  Opinion with the head of faith while the opponent does not have 40  Opinion or a  strong hook on them.

If the Scales of Power favor the diarch then the liege will have to pay  Prestige for mundane actions. Mundane actions are revoking a title, retracting a vassal, imprisoning a character or executing characters unless the liege's faith has the Human Sacrifice or Gruesome Festivals tenet.

Regency

Normal regency occurs for a ruler who is imprisoned or away on an activity taking place outside their realm (for underage or  Incapable rulers, see Entrenched Regency), and typically ends automatically when that is no longer the case. While active realm power is shared between the ruler and an appointed diarch, who serves as their liege's regent. Most regencies are short-term arrangements, but longer-term power sharing can become entrenched and effectively become the de-facto power in the realm. Under regency the liege has +10%  Stress Loss and the regent has +15%  Stress Gain.

Regency has its own succession based on  Opinion and character stats. The player heir, spouse, guardian, family members and landless characters take precedence, especially should these factors stack. The regent can be designated manually by the liege every 10 years but it will reduce  Opinion with any character higher in the succession hierarchy as well as all Courtly vassals.

Normal regency has 4 levels. Each level grants the diarch unique interactions called borrowed powers. Borrowed powers can be vetoed by the liege by spending  Prestige, and using Borrowed powers may cause Strife - an  Opinion penalty with all of the liege's vassals. Initially Scales of Power has the following levels:

Level	Scales	Borrowed power	Borrowed power effects
1	0-33	Siphon Treasury	Stewardship challenge targeting the liege. The difficulty scales with the amount chosen. On success gain  Gold and the Embezzler secret. One of the liege's counties will lose Holding Taxes,  Control or  Development scaling with the amount chosen and the diarch's  Stewardship. On failure gain 15-50 Strife and lose 30-75  Opinion with the liege depending on the amount chosen. Failure is also a crime.
2	34-66	Regent Imprison	Targets the liege's vassals and courtiers. The liege can veto the interaction at the cost of 150  Prestige. On success imprison the targeted character and gain 15 Dread and 15 Strife. On failure gain Tyranny if the target is a courtier and starts a war with the Remove Regent casus belli if the target is a vassal.
3	67-99	Legal Meddling	Targets the liege's vassals. Can choose to pay 150  Prestige (success), 50  Prestige (50% chance of success) or do a  Learning challenge. On success gain an  Unpressed Claim on the vassal's primary title and 10 Strife. On failure gain  Stress.
4	100	Modify Vassal Contract Entrench Regency	Targets the liege. Lowers one obligation or adds a right to the vassal contract at the cost of 40  Opinion with the liege. Regency becomes Co-Monarchy.

Unless the Scales of Power are at level 1, ending a regency requires using  Prestige,  Piety,  Gold or offering a  Weak Hook, unless the diarch has Selfless loyalty.

Entrenched Regency and Co-Monarchy

Entrenched Regents and Co-Monarchs have similar powers at the steps on the scale. However, there are some key differences.

• Co-Monarchy is started when  Feudal or  Tribal  King or  Emperor chooses to appoint a family member as co-monarch, in which case the diarch is also automatically appointed as designated heir. It can only be ended by imprisoning and executing the co-monarch. The scales of power balance at 50.
• Entrenched Regency is automatic for an underage ruler or when a ruler becomes Incapable. A normal regency can also be entrenched at level 4, as described in the above table for 150  Prestige. The scales of power balance at 50.
  • If a ruler comes of age, the new balance for the scales is at 0. In addition, the ruler gains access to the Discharge Entrenched Regent interaction at scale levels 1-4. The ruler may attempt to convince a regent to leave for a hook, gold, or nothing at all once a year. If they reject the interaction, the scales will still swing 20 toward the ruler. Since regents may only swing the scales by 10 once every two years (outside of events), this strongly limits how long regents of children can hold onto power. At scale level 1, the regent may not refuse dismissal.

Level	Scales	Effects	Liege mundane action cost
1	0-19	Diarch can use the Siphon Treasury borrowed power on the liege Diarch can use the Subsidize Liege Authority borrowed power on the liege	0
2	20-39	Diarch gets a free extra change to their Vassal Contract Diarch can use the Shift Privileges borrowed power on the liege's vassals	0
3	40-59	Diarch can use the Legal Meddling borrowed power on the liege's vassals Diarch can use the Diarch Revoke Title borrowed power on the liege's vassals if they have a claim on one of its titles and realm has enough Crown Authority	75+
4	60-79	Diarch can use the Diarch Imprison borrowed power on the liege's vassals and courtiers Diarch can use the Diarch Retract Vassal borrowed power on the liege's vassals if realm has enough Crown Authority	150+
5	80-94	Diarch can use the Elevate Self to Co-Emperor borrowed power if Duumvirate conditions are met	250+
6	95-100	Diarch can use the Attempt to Overthrow Liege decision Diarch can use the Invite Conspirators to Coup borrowed power	350+

Vizierate

Vizierate occurs when a clan ruler appoints a vizier. The diarch gains access to the Siphon Treasury borrowed power while the liege gains access to the Mulct Vizier interaction with the diarch, gaining gold and swinging Scales of Power towards the diarch. If the diarch is also a  Tax Collector then it gains 50% of the current Scales of Power as Tax Collector Aptitude

Unless at level 1, ending the power sharing will give a negative Monthly Income modifier that depends on the current Scales of Power. Alternatively the power sharing can be ended without penalties by giving the diarch a landed title.

Under Vizierate the Scales of Power go up to level 7. As levels increase,  Tax Collectors gain an aptitude bonus depending on the diarch's own aptitude. At max level it unlocks for the diarch the Attempt to Overthrow Liege decision.

Level	Scales	Tax collector bonus	End power sharing penalty	Liege mundane action cost
1	0-19		0%	0
2	20-39	+10%	16%-24% unless granting a County	0
3	40-59	+20%	32%-40% unless granting a County	0
4	60-69	+40%	48% unless granting a Duchy	75+
5	70-79	+40%	56% unless granting a Duchy	150+
6	80-89	+60%	64% unless granting a Duchy	250+
7	90+	+60%	72%-80% unless granting a Duchy	350+

Duumvirate

Duumvirate is a form of power sharing only available to  Emperors whose culture has the Roman Ceremonies tradition, and only family members can be appointed as diarchs. The liege gets a percentage  Influence bonus while the diarch gets a flat monthly bonus, which both increase every 5 years of power sharing, including those with a Nominal Duumvirate. Children of the diarch can also gain the  Born in the Purple trait if the other requirements are met.

Under a Duumvirate the diarch always becomes the Designated Heir and if they execute their liege or defeat them in war they take all the liege's titles. If a Designated Heir previously existed they will lose 50  Opinion.

Between the liege and the diarch, if one of them has greater either  Diplomacy or  Intrigue they can use the Scapegoat interaction on the other, which costs  Prestige and gives  Influence. However both characters will gain Tyranny.

Level	Scales	Effects	Administrative bonus	Liege mundane action cost
1	0-20	Diarch can use the Siphon Treasury borrowed power on the liege Diarch can use the Co-Emperor Imprison borrowed power on the liege's vassals Diarch can use the Shift Privileges borrowed power on the liege's vassals	+50%	0
2	21-40	Diarch can use the Co-Emperor Revoke Title borrowed power on the liege's vassals Diarch can use the Co-Emperor Retract Vassal borrowed power on the liege's vassals Diarch can use the Adjust Bureaucracy borrowed power on the liege	+75%	0
3	41-60	Diarch can use the Demand Private Despotate borrowed power on the liege	+100%	75+
4	61-80	Diarch can use the Request Imperial Expedition borrowed power on the liege	+150%	150+
5	81-100	Diarch can use the Attempt to Overthrow Liege decision	+150%	250+

Nominal Duumvirate

Children can be given a Nominal Duumvirate instead. Upon becoming adult the power sharing will be turned into a regular Duumvirate, the diarch receives additional skill points depending on the Scales of Power swing and the Scales of Power swing is reduced by half. Both characters get the same  Influence bonus as from a regular Duumvirate. The liege can swing the Scales of Power both ways and swinging them towards the diarch is free and gives +20  Opinion with them.

Level	Scales	Adulthood skill points	Administrative bonus
1	0-20
2	21-40	+2 in the education skill +1 in two other skills	+50%
3	41-60	+3 in the education skill +2 in two other skills	+75%
4	61-80	+4 in the education skill +3 in two other skills	+100%
5	81-100	+5 in the education skill +4 in two other skills	+150%

In 1066 the Byzantine Empires starts with a Duumvirate while in 1178 it starts with a Nominal Duumvirate.

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