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A merchant republic trade post holding

Trade posts are income-generating holdings that do not count toward a ruler's demesne limit. They can be built by merchant republics in coastal provinces (including provinces they do not own). With the Horse Lords or Jade Dragon DLC, they can also be built by local rulers along the Silk Road or the Trans-Saharan Trade Route.

Contiguous trade posts with the same owner create trade zones. Large, rich trade zones boost the income of their trade posts, along with the income of cities in the zone's provinces.

Merchant republic trade posts

Each patrician can build a limited number of trade posts based upon the size of his family palace, the number of dynastic men he has in his court, and the level of Trade Practices technology in the republic's capital (not the patrician's capital, should the two be different).

Merchant republic trade posts have a base cost of 150 wealth to build and take 12 months. The cost is increased by 30% times the distance to the closest settlement controlled by the builder of the trade post. (For landless patricians, the distance is calculated from the location of their court, which is usually the republic's capital.) The distance is calculated by sea unless the province is adjacent. The cost is also modified by 40% times the province's top liege's opinion of the builder.

Republics with a trade post in a county have a 'Seize City' CB on the local city, subject to various constraints.

Feudal rulers with trade posts in their land receive an Embargo Casus Belli on the Republic, which if successful will raze the trade posts within their borders for a handsome payout. Rulers also have random event chains to attempt to destroy a trade post within their demesne or to demand a bribe from the post's family. Additionally, one Merchant Republic can offer monetary inducements to a Kingdom or Empire to embargo another Republic.

Base stats

	Characteristic	Value
	Income	6
	Fort level	0
	Levies	0

Requirements

All Merchant republic trade post building lines share the same basic requirements as described below.

Building	Level 1	Level 2	Level 3
Cost	100	150	200
Construction time	182	274	365
Lot Requirements		Building level 1	Building level 2

Upgrades

Building Line	Level I	Level II	Level III
Garrison	+1 Fort level +100 Garrison size +20 Retinue cap	+2 Fort level +150 Garrison size +30 Retinue cap	+3 Fort level +200 Garrison size +50 Retinue cap
Merchant Enclave	+1 Tax income	+1.5 Tax income	+2 Tax income Yes enables Scouting
Merchant Port	+10 Trade value	+15 Trade value	+20 Trade value

Trade Post limit

The trade post limit of a given patrician is calculated using the following formula:

Trade post limit = (1 + PalaceBonus + Number of unlanded adult male dynasty members in court) * (1 + Trade Practices technology bonus)

• The result of the above formula is rounded (.5 is rounded up).
• "Palace bonus" is determined by the number of extra trade posts granted by the main building upgrade in a patrician's Family Palace (+0, +3, +6, +9 respectively).
• The Trade Practices technology bonus is a multiplier with the following values at each level: -0.667/-0.333/0.00/0.10/0.20/0.30/0.40/0.50

Example: a patrician with level 4 in Trade Practices in the republic's capital, a Grand Palace (level IV upgrade), 3 sons, 1 brother and no other living unlanded adult male family member is expected to have (1+9+4)*1.10=15.4 i.e. 15 trading posts.

Silk Road trade posts

主条目：Silk Road

The Horse Lords or Jade Dragon DLCs allow any ruler to build trade posts at specific provinces along the Silk Road land route between China and Europe. Silk Road trade posts can be owned by either the owner of a province or a patrician, and cost 50 gold to build.

The Silk Road is visible in the Economy and Trade Zone map modes. If a Silk Road province is occupied or is being sieged during a war, the value of trade flowing through the province will be reduced by 10% if under siege and 25% for occupation. Both the trade zone controlled by the province owner and the total trade value along the entire route affect income.

Note that even without trade posts, Silk Road provinces receive passive boosts to taxes from castles, cities and temples.

Silk Road buildings

Coastal Silk Road provinces which are considered important locations can have both standard trade post buildings and Silk Road buildings, if their owner is a merchant republic.

Name	Price	Build time	Effects	Requirements
Silk Road Trading Post	200	150	+1 Trade route wealth, +30 Trade value	Trade practices 1
Silk Road Market	400	300	+2 Trade route wealth, +50 Trade value, +1 fort level	Silk Road Trading Post, Trade practices 2
Major Silk Road City	800	600	+4 Trade route wealth, +70 Trade value, +1 fort level	Silk Road Market, Trade practices 4
Trade Offices 1	200	600	+25% tech spread rate, +0.25 monthly prestige, +50 retinue size	Trade practices 1
Trade Offices 2	600	600	+0.5 monthly prestige, +100 retinue size	Trade Offices 1, Trade practices 2
Trade Offices 3	1200	600	+1.75 monthly prestige, +150 retinue size	Trade Offices 2, Trade practices 4
Mercenary Garrison 1	200	600	+300% garrison size, +5 Trade value	Trade practices 1
Mercenary Garrison 2	400	600	+300% garrison size, +10 Trade value, +1 fort level	Mercenary Garrison 1, Trade practices 2
Mercenary Garrison 3	600	600	+300% garrison size, +15 Trade value, +1 fort level	Mercenary Garrison 2, Trade practices 4
Radhanite Quarter 1	150	400	+10% garrison size, +5% tech spread rate, +10 Trade value, +0.5 Trade route wealth, +0.01 military tech points, +0.01 economic tech points, +0.01 cultural tech points	Israelite culture group or Jewish religion or Khazar culture, Trade practices 1
Radhanite Quarter 2	250	600	+20% garrison size, +10% tech spread rate, +20 Trade value, +1 Trade route wealth, +0.02 military tech points, +0.02 economic tech points, +0.02 cultural tech points	Radhanite Quarter 1, Israelite culture group or Jewish religion or Khazar culture, Trade practices 3
Radhanite Quarter 3	350	800	+30% garrison size, +15% tech spread rate, +40 Trade value, +2 Trade route wealth, +0.03 military tech points, +0.03 economic tech points, +0.03 cultural tech points	Radhanite Quarter 2, Israelite culture group or Jewish religion or Khazar culture, Trade practices 4

Trans-Saharan Trade Route trade posts

The Trans-Saharan Trade Route in yellow, in the western half of the map; provinces that can have Trade Posts are in orange.

Introduced in Patch 3.0 alongside map changes to North and sub-Saharan Africa, these trade posts also require Horse Lords or Jade Dragon DLCs to use. They operate similarly to the Silk Road route, with some differences.

Like the Silk Road, the Trans-Saharan Trade Route is visible in the Economy and Trade Zone map modes. Occupation or siege also reduces the value of trade flowing through the province, by 10% and 25% respectively. Both the trade zone controlled by the province owner and the total trade value along the entire route affect income.

Different from the Silk Road, provinces do not receive as large a passive boost to taxes from castles, cities and temples. This means that the value of Trans-Saharan Trade Route largely can be found in Trade Post provinces, and of those, in provinces where special production buildings can be constructed.

Trans-Saharan Trade Route buildings

Like coastal Silk Road provinces, coastal Trans-Saharan Trade Route buildings can have both standard trade post buildings and Trans-Saharan Trade Route buildings, if their owner is a merchant republic. However, as the three coastal Trans-Saharan Trade Route provinces (Anti-Atlas, Cebta, and Tripolitana) lack the the ability to build the Trans-Saharan production buildings, the difference is less pronounced than with the Silk Road provinces.

Notably, none of the Trans-Saharan Trade Route buildings add any Garrison or Fort level to the provinces. The trade post holdings must be protected by the main holdings of the province.

The most valuable of these provinces, the Gold Production provinces of Bure and Bambuk, will periodically give out gold to whomever owns them, but will also deplete, rendering the Gold production buildings on the province inactive, and hand out inflation province modifiers.

Name	Price	Build time	Effects	Requirements
Saharan Trade Post	200	150	+1 Trade route wealth, +20 Trade value	Trade practices 1, Not be one of the Trans-Saharan Gold production or Salt production provinces
Saharan Trade Market	400	300	+2 Trade route wealth, +40 Trade value, +1 fort level	Saharan Trading Post, Trade practices 2
Saharan Trade City	800	600	+4 Trade route wealth, +60 Trade value, +1 fort level	Saharan Trading Center, Trade practices 4
Gold Field	100	182	+5 Trade route wealth, +100 Trade value, +.25 Monthly Prestige This building is only active when the province does not have the Depleted Gold Mine province modifier	Be one of the Trans-Saharan Gold production provinces Bure Bambuk
Gold Mine 2	400	365	+10 Trade route wealth, +150 Trade value, +.5 Monthly Prestige This building is only active when the province does not have the Depleted Gold Mine province modifier	Gold Field, Trade practices 1, Construction 1
Large Gold Mine 3	1000	730	+15 Trade route wealth, +200 Trade value, +1 Monthly Prestige This building is only active when the province does not have the Depleted Gold Mine province modifier	Gold Mine 2, Trade practices 2, Construction 2
Salt Mine	250	182	+5 Trade route wealth, +60 Trade value, +.25 Monthly Prestige +0.01 military tech points	Construction 2 Be one of the Trans-Saharan Salt production provinces Aoudaghost Taghaza
Cloth Market	200	182	+5 Trade route wealth, +75 Trade value, +.25 Monthly Prestige +0.01 economy tech points	Trade practices 1, Be the Trans-Saharan Cloth production province Timbuktu

References

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