Japanese feudalism was very different from European feudalism, with where the authority lied and how sovereignty worked etc.
If Japan gets added and naval gameplay gets a boost, piracy should be added in.
Japan specific (from the perspective of Japanese Buddhist/Shinto characters; obviously the norse pagan King of Sweden doesn't have to observe many of these rules during his fishing trip in the Sea of Japan)
* It should be extremely difficult to overthrow the emperor. He's believed to be literally a descendant of god, to the extent that even in WW2 Japan didn't surrender unless they were guaranteed that the emperor would remain emperor. You could weaken him all you want, but overthrowing him is like getting a big curse upon yourself. Everyone will hate you.
* Japan by size is also small enough so ruling as a shogun (let's make him a King in-game) shouldn't be a problem. Enable it after a certain degree of authority in feudalism. Heian and Nara Japan were roughly feudal but mostly autonomous clans, and it was the Kamakura period that the consolidation of power became more apparent.
* Emperor should be a hybrid religious/secular character who is succeeded by dynastic Agnatic descent. Male members of the Emperor's dynasty wouldn't be allowed to marry matrilineally as long as Japanese religion is a thing.
* Of course you could get descendants into your dynasty matrilineally or outside wedlock and then press their claims to put your own house on the imperial throne. But this would weaken the authority of the emperor completely, until the Yamato line is restored (something about only the Yamato having the sovereign right to hold the title), or until a certain number of generations of your house have ruled. The people would reconcile with the fact that you do have some legitimacy because you were descended from Amaterasu even though not a part of the Yamato line, and that it must have been a work of the spirits to punish an emperor who had gone decadent.
* There should be a bonus with emperors and heirs of emperors who are born to your close relatives.
* If you have a clan, say Tokugawa, it can't be vassalized between multiple lieges, say Fujiwara and the Yamato, because family bonds. If a clan gets split, the part that gets split off becomes a new clan. You could use this to reduce the power base of clans.
* Emperor could declare you an enemy and that could result in civil war against you. All clans would have to comply. Emperors could do this to control your power when their authority is weak and they are ambitious.
* Divorces should be easier, because for a time women were seen more as spies of the other family and for producing heirs. Children would be locked to education in the mother's family's realm until the age of 12. This is crucial for influencing the emperor.
* Of course, samurai class. Army commanders could only be from that class. Retinues would be samurai, levies would be peasants. Levies would be much weaker than retinues, and you would have a much larger relative retinue limit than other nations in the game with a similar technology level after the shogunate is established.
* Temple/Barony/City mechanics would be different from European tiles. Temples would provide next to no levies, with moderate taxes at the highest level. There would be no cities, only villages, which would provide mostly peasant levies and lots of tax. Baronies would provide lots of samurai but little tax.
Possible starting situation:
Between 793 and 1192, the emperor is generally very powerful. The shogunate does not exist, only the clans do with the heads being called governors (shugo). The title of shogun would be honorary and awarded by the emperor to any of his direct vassals. He could choose to establish the shogunate, which would create the kingdom-level title of shogun that would have to be awarded to one of the clans. The titles of the shugo will convert to daimyo. During the Kamakura period, the Shogunate would already be established (the Shogunate start?).
If Japan gets added and naval gameplay gets a boost, piracy should be added in.
Japan specific (from the perspective of Japanese Buddhist/Shinto characters; obviously the norse pagan King of Sweden doesn't have to observe many of these rules during his fishing trip in the Sea of Japan)
* It should be extremely difficult to overthrow the emperor. He's believed to be literally a descendant of god, to the extent that even in WW2 Japan didn't surrender unless they were guaranteed that the emperor would remain emperor. You could weaken him all you want, but overthrowing him is like getting a big curse upon yourself. Everyone will hate you.
* Japan by size is also small enough so ruling as a shogun (let's make him a King in-game) shouldn't be a problem. Enable it after a certain degree of authority in feudalism. Heian and Nara Japan were roughly feudal but mostly autonomous clans, and it was the Kamakura period that the consolidation of power became more apparent.
* Emperor should be a hybrid religious/secular character who is succeeded by dynastic Agnatic descent. Male members of the Emperor's dynasty wouldn't be allowed to marry matrilineally as long as Japanese religion is a thing.
* Of course you could get descendants into your dynasty matrilineally or outside wedlock and then press their claims to put your own house on the imperial throne. But this would weaken the authority of the emperor completely, until the Yamato line is restored (something about only the Yamato having the sovereign right to hold the title), or until a certain number of generations of your house have ruled. The people would reconcile with the fact that you do have some legitimacy because you were descended from Amaterasu even though not a part of the Yamato line, and that it must have been a work of the spirits to punish an emperor who had gone decadent.
* There should be a bonus with emperors and heirs of emperors who are born to your close relatives.
* If you have a clan, say Tokugawa, it can't be vassalized between multiple lieges, say Fujiwara and the Yamato, because family bonds. If a clan gets split, the part that gets split off becomes a new clan. You could use this to reduce the power base of clans.
* Emperor could declare you an enemy and that could result in civil war against you. All clans would have to comply. Emperors could do this to control your power when their authority is weak and they are ambitious.
* Divorces should be easier, because for a time women were seen more as spies of the other family and for producing heirs. Children would be locked to education in the mother's family's realm until the age of 12. This is crucial for influencing the emperor.
* Of course, samurai class. Army commanders could only be from that class. Retinues would be samurai, levies would be peasants. Levies would be much weaker than retinues, and you would have a much larger relative retinue limit than other nations in the game with a similar technology level after the shogunate is established.
* Temple/Barony/City mechanics would be different from European tiles. Temples would provide next to no levies, with moderate taxes at the highest level. There would be no cities, only villages, which would provide mostly peasant levies and lots of tax. Baronies would provide lots of samurai but little tax.
Possible starting situation:
Between 793 and 1192, the emperor is generally very powerful. The shogunate does not exist, only the clans do with the heads being called governors (shugo). The title of shogun would be honorary and awarded by the emperor to any of his direct vassals. He could choose to establish the shogunate, which would create the kingdom-level title of shogun that would have to be awarded to one of the clans. The titles of the shugo will convert to daimyo. During the Kamakura period, the Shogunate would already be established (the Shogunate start?).
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