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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。Ⅱ级君权（有限君权）需要全体大会革新 （部落时期），而Ⅲ级（高君权）和Ⅳ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 | Ⅰ级效果 | Ⅱ级效果 | Ⅲ级效果 | Ⅳ级效果 |
|---|---|---|---|---|
| 君权 |
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| 部落权威 |
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Titles can be revoked
Enables all Partition Succession Laws
Clan Government Vassals provide at least 2% Income
Clan Government Vassals provide at least 5% Levies
Refusing Title Revocation is a Crime
Enables the Adopt Feudal Ways through Liege decision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, realm and title.
Gender Law
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The Gender Law determines which gender can inherit Titles and Claims and who can have more than one partner if its Faith Doctrines allow. Changing the Gender Law costs 500 
Prestige and requires all Powerful Vassals to have a positive 
Opinion of the Liege.
| Law | Inheritance | Concubinage and Polygamy | Required Views on Gender doctrine |
|---|---|---|---|
| Male Only | Men only | Men only |  Male Dominated
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| Male preference | Men take precedence | Men only | Male Dominated Equal
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| Equal | Both genders | Both genders | Equal
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| Female preference | Women take precedence | Women only | Equal Female Dominated
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| Female Only | Women only | Women only | Female Dominated
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Realm Succession
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The Realm Succession Law determines which and how many heirs will inherit the character's Titles upon death. Changing the Succession Law costs 500 Prestige and requires all Powerful Vassals to have a positive Opinion of the Liege. All children will gain Claims on Titles they did not inherit regardless of the Realm Succession Law.
| Heir number | Law | Required Innovation | Opinion | Effect |
|---|---|---|---|---|
| Multiple Heirs | Confederate Partition | Gavelkind (Tribal Era) | +5 Direct Vassal +5 House +10 Eligible Child |
Upon succession, all Titles held by the late Ruler will be divided amongst their Eligible Children, with the Player Heir always being given the Primary Title, Realm Capital and any direct De Jure Titles associated with it. Younger children will be given Titles starting with those of the same Rank as the Primary Title, if none are available they will be given lower-ranking Titles. Children can not be preemptively granted Titles they do not stand to inherit. Younger children will have Titles created for them, if enough land is held. |
| Partition | Hereditary Rule (Early Medieval Era) | +5 Direct Vassal +5 Eligible Child +10 Player Heir |
Upon succession, all Titles held by the late Ruler will be divided amongst their Eligible Children, with the Player Heir always being given the Primary Title, Realm Capital and any direct De Jure Titles associated with it. Younger children will be given Titles starting with those of the same Rank as the Primary Title, if none are available they will be given lower-ranking Titles. Children can not be preemptively granted Titles they do not stand to inherit. | |
| High Partition | Heraldry (High Medieval Era) | +5 Direct Vassal +15 Player Heir |
Upon succession, all Titles held by the late Ruler will be divided amongst their Eligible Children, with the Player Heir always being given the Primary Title, Realm Capital and any direct De Jure Titles associated with it. Younger children will be given Titles starting with those of the same Rank as the Primary Title, if none are available they will be given lower-ranking Titles. Children can not be preemptively granted Titles they do not stand to inherit. The Player Heir will always inherit at least half of the late Ruler's Titles. | |
| Single Heir | Primogeniture | Primogeniture (Late Medieval Era) | +20 Player Heir -5 Eligible Child |
Upon succession, all of the late Ruler's Titles will be given to the Player Heir, which is their oldest Eligible Child. Younger children will receive nothing. |
| Ultimogeniture | Primogeniture (Late Medieval Era) | +20 Player Heir -5 Eligible Child |
Upon succession, all of the late Ruler's Titles will be given to the Player Heir, which is their youngest Eligible Child. Older children will receive nothing. | |
| House Seniority | Heraldry (High Medieval Era) | +5 House -5 Direct Vassal -15 Eligible Child |
Upon succession, all of the late Ruler's Titles will be given to the oldest eligible member of their House. Your children will not be given anything, unless one of them happens to be the oldest House member. |
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/