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法律（Laws） 决定了领地的体系，对领地的发展有至关重要的影响。
权威
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封建制和氏族制政体拥有君权法，在发现所需革新后可以提高君权；此法律每20年可以更改一次。2级君权（有限君权）需要全体大会革新 （部落时期），而3级（高君权）和4级（绝对君权）君权需要王室特权革新（中世纪早期）。
部落制政体拥有部落权威法，不需要革新便可以提高部落权威；此法律每10年可以更改一次。改变部落权威的花费主要与统治者领地规模大小成正比，其次受统治者的 
Learning 能力的影响。
| 权威 | 1级效果 | 2级效果 | 3级效果 | 4级效果 |
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| 君权 |
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| 部落权威 |
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可以剥夺头衔
统治者能选择可用的分割继承制继承法
氏族制封臣会提供至少2%的收入
氏族制封臣会提供至少5%的征召兵
所有拒绝收回封臣或剥夺头衔的封臣会被认为是罪犯
角色不能被囚禁
非部落制领主下的部落制统治者可以定居，并转变为封建制或氏族制继承法
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共有三种类型的法律影响头衔的继承：性别，领地和头衔。
性别法
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性别法决定可以继承头衔和宣称的性别，以及谁可以拥有多个配偶（如果信仰允许）。更改性别法花费500 
Prestige 威望并且要求所有强力封臣对领主有正面 
Opinion 好感。
| 法律 | 继承 | 侧室和多配偶 | 要求的性别观点教义 |
|---|---|---|---|
| 仅男性 | 仅男性 | 仅男性 |  男性主导
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| 男性优先 | 男性优先 | 仅男性 | 男性主导 男女平等
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| 男女平等 | 两种性别 | 两种性别 | 男女平等
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| 女性优先 | 女性优先 | 仅女性 | 男女平等 女性主导
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| 仅女性 | 仅女性 | 仅女性 | 女性主导
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领地继承法
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领地继承法决定多少以及哪些继承人会在角色去世后继承其头衔。更改继承法花费500 Prestige 威望，要求所有强力封臣对领主有正面 Opinion 好感。无论什么领地继承法，所有孩子将对他们未获得的头衔拥有宣称。
| 法律 | 要求革新 | 好感 | 效果 | |
|---|---|---|---|---|
| 多个继承人 | 联盟分割继承制 | 均分继承（部落时期） | +5 直属封臣 +5 家族 +10 有继承资格的子女 |
在继承中，上一任统治者的所有头衔都会被划分给其有继承资格的子女，玩家继承人会得到主头衔、领地首都和与之相关的所有直属法理头衔。 年幼的子女将获得与主头衔同等级的头衔；如果没有，他们将获得较低等级的头衔。你的玩家继承人将无法被预先授予不会被其继承的头衔。 如果持有足够的土地，会为较年幼的孩子创建新的头衔。 |
| 分割继承制 | 世袭统治（中世纪早期） | +5 直属封臣 +5 有继承资格的子女 +10 玩家继承人 |
在继承中，上一任统治者的所有头衔都会被划分给其有继承资格的子女，玩家继承人会得到主头衔、领地首都和与之相关的所有直属法理头衔。 年幼的子女将获得与主头衔同等级的头衔；如果没有，他们将获得较低等级的头衔。你的玩家继承人将无法被预先授予不会被其继承的头衔。 | |
| 高等分割继承制 | 纹章学（中世纪盛期） | +5 直属封臣 +15 玩家继承人 |
在继承中，上一任统治者的所有头衔都会被划分给其有继承资格的子女，玩家继承人会得到主头衔、领地首都和与之相关的所有直属法理头衔。 年幼的子女将获得与主头衔同等级的头衔；如果没有，他们将获得较低等级的头衔。你的玩家继承人将无法被预先授予不会被其继承的头衔。 玩家扮演继承人总是会继承上任统治者至少一半的头衔。 | |
| 单继承人 | 长子继承制 | 长子继承法（中世纪晚期） | +20 玩家继承人 -5 有继承资格的子女 |
在继承中，上任统治者的所有头衔都会被交给其玩家继承人，即其最年长的有继承资格的子女。其他更年幼的孩子什么也得不到。 |
| 幼子继承制 | 长子继承法（中世纪晚期） | +20 玩家继承人 -5 有继承资格的子女 |
在继承中，上任统治者的所有头衔都会被交给其玩家继承人，即其最年幼的有继承资格的子女。其他更年长的孩子什么也得不到。 | |
| 家族年长者继承制 | 纹章学（中世纪盛期） | +5 家族好感 -5 直属封臣好感 -15 有继承资格的子女 |
在继承中，上任统治者的所有头衔都会被交给其家族最年长的合法成员。你的子女什么也得不到，除非他们中的某位恰好是最年长的家族成员。。 |
Title Succession
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Feudal Rulers can apply a Title Succession Law on Duchy, Kingdom or Empire titles at the cost of 1500 Prestige. Note that this will only affect the succession law for the title in question; other titles the character holds will be distributed normally. (This can lead to unexpected results.)
| Law | Direct Vassal Opinion | Effect | Requirements |
|---|---|---|---|
| Feudal Elective | +10 | The Ruler and all direct De Jure Vassals of one or two Ranks below the Title can nominate an Heir from amongst themselves and the Close Family of the Ruler. | Not Anglo-Saxon culture Not North Germanic culture group |
| Saxon Elective | +5 | The Ruler and all direct De Jure Vassals of one or two Ranks below the Title can nominate an Heir from the most Powerful Vassals amongst them, the Ruler's Legitimate children, and any other valid Claimant. | Anglo-Saxon cultue Title rank is kingdom or empire |
| Scandinavian Elective | +5 | The Ruler and all De Jure Vassals (except Barons) can nominate an Heir amongst the Ruler's Extended Family and any available Claimants. Voting Power in this Succession Law is influenced by the Elector's total Domain Development and Capital Popular Opinion. Known criminals are not eligible Heirs, but their descendants are. Grandchildren of non-criminal, living children are not eligible Heirs. | North Germanic culture group |
| Tanistry Elective | +5 | The Ruler and Vassals of one or two Ranks below the Title can nominate an Heir - the Tanist - from among the members of the Ruler's Dynasty. Vassals will tend to favor older, distant relatives over Close Family. | Brythonic or Goidelic culture group Title rank is kingdom or empire |
| Princely Elective | +10 | The Emperor and the seven Prince-Electors can nominate an Heir from amongst themselves, any Legitimate children and siblings of the ruler, as well as any other major De Jure Vassal of the Empire. If an historical elector Title is held by infidels or does not exist, another De Jure Vassal will take its place. This Succession Law places a significant importance on Faith and Piety. The Electoral Titles for this realm are the Counties of Cologne, Mainz and Trier, and the Duchies Bohemia, East Franconia, Ostfalen and Ostmark. Removing this Law costs 10000 Prestige. |
Holy Roman Empire title |
Strategies
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- Monitor which holdings will be lost upon succession: Click the "Succession" tab under the "Realm" window.
- Get out of Confederate Partition as soon as possible: It is the only succession law which creates new titles upon succession, thus almost guaranteeing a split in the player's realm unless the player restricts the realm to the De Jure Counties of their primary duchy or kingdom. If expanding, they should aim to occupy at most 50% of other duchies/ kingdoms to avoid having enough land to cause a split.
- Tribal realms are locked to Confederate Partition; they must reform to either Clan or Feudal government before being able to select other succession types.
- If you have a partition succession and multiple heirs, you may want to remove all heirs except one, if possible, so that your primary heir inherits all titles. This is difficult to do, but there are ways. (Sons with low prowess can be forced to serve as knights, and may die in combat. If you are the dynasty head, you can disinherit all heirs but one. If you have the sadistic personality trait, you can use murder schemes against your children. Etc.)
- If an event allows you to choose an "elective" title succession law, be aware that this only applies to the title in question. For instance, if you play as the King of Scotland (Goidelic culture group) and you have partition succession, switching Scotland to "Tanistry Elective" will not affect how your duchies and counties are distributed. When you die, if your primary heir is not your tanist, you may find yourself playing a new king with very few holdings and a great deal of internal "border gore".
- If you have another kingdom in addition to Scotland, then Scotland will be completely removed from partition. All your titles under de jure Scotland will be inherited by the tanist, and your children will inherit the second kingdom and other external titles. This will split your former realm but you will not lose all your domain. On the other hand, if this second kingdom is also under tanistry, it will also be removed from partition and your children will only divide your titles outside of both kingdoms. This will not split your realm, but the electors in both kingdoms have to elect the same person.
- If you only have one kingdom with tanistry and partition, you can save your domain by adding tanistry law to your duchies. This is expensive (1500 prestige) but such a duchy will be removed from partition and its de jure counts (which is usually only you) will vote for the successor of the duchy title. You should appoint the same person who is going to inherit the kingdom.
Additional Info
"Succession Laws EXPLAINED", forum thread: https://forum.paradoxplaza.com/forum/threads/succession-laws-explained.1419049/