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Crusader Kings 3: An Analysis of the Accuracy of Historical Incestuous Marriages
This video analyzes the incest system implemented in Crusader Kings 3 from a historical and biological perspective, and compares actual historical cases with the system in the game. It introduces the genetic concept of 'inbreeding coefficient' and details the workings of the in-game incest system, the case of the Habsburg family in history, and the process of achieving the 'Perfect Circle' challenge in the game.
1. 🎮 Incest in Crusader Kings 3: History, Biology, and Game Mechanics
- ✅ Let's explore how incest is implemented in Crusader Kings 3.
- ✅ Compare and analyze historical facts and game mechanics.
- ✅ Learn about the effects of incest from a genetic and biological perspective.
00:03 - 00:28
1. 🎮 Incest in Crusader Kings 3: History, Biology, and Game Mechanics
- ✅ Let's explore how incest is implemented in Crusader Kings 3.
- ✅ Compare and analyze historical facts and game mechanics.
- ✅ Learn about the effects of incest from a genetic and biological perspective.
00:29 - 00:43
2. 🧬 Inbreeding Coefficient: The Risks of Incest from a Genetic Perspective
- ✅ Introducing the concept of 'inbreeding coefficient' defined by American geneticist Sewall Wright in 1921.
- ✅ The inbreeding coefficient calculates the probability of inheriting the same gene from ancestors shared by parents.
- ✅ Incest increases the likelihood of recessive genes that cause genetic disorders being expressed.
00:44 - 01:10
3. ⚙️ Crusader Kings 3's Incest System: How it's Implemented in the Game
- ✅ The game determines the risk of negative traits appearing based on the number of shared ancestors within the last four generations.
- ✅ The 'Inbred' trait indicates a serious genetic disorder, and negative traits such as infertility, frailty, and deformity may appear.
- ✅ Positive traits such as genius or Hercules can also appear, which may be why players pursue incest.
- ⚠️ The 'Pure-Blooded' trait reduces the negative effects of incest, but this is scientifically unrealistic.
01:11 - 01:22
4. 📜 Historical Perspective: Legal and Religious Stances on Incest
- ✅ In the game, whether incest is allowed depends on the tenets of the faith.
- ✅ Historically, the Christian Church took a strict stance against incest until the Middle Ages.
- ✅ Later, special permissions were granted for powerful rulers.
01:23 - 01:40
5. 🏰 Historical Case: The Habsburg Family's Incest and its Tragedy
- ✅ The Habsburg family is notorious for incest, and the 'Habsburg jaw' in particular was a result of excessive inbreeding.
- ✅ Charles II of Spain suffered from severe disabilities, and the War of the Spanish Succession broke out due to his lack of an heir.
01:41 - 06:44
6. 📈 Calculating the Probability of Incest in Crusader Kings 3 and Comparing it to Actual History
- ✅ The in-game method of calculating the probability of incest is somewhat more lenient than actual genetic probabilities.
- ✅ For example, in reality, the probability of negative outcomes from marriage between siblings is 25%, but in the game it is 15%.
- ✅ In the game, it is relatively safe to avoid marriages within the second degree of consanguinity.
06:45 - 07:57
7. 📜 Incest Cases at the Start of the Game and the 'Perfect Circle' Challenge
- ✅ It is difficult to find cases of incest at the start of the game, but players can set them up themselves.
- ✅ The 'Perfect Circle' challenge involves marrying siblings for three generations so that parents, grandparents, and great-grandparents are each only two people.
07:58 - 15:30
8. 🕹️ Attempting the 'Perfect Circle' Challenge: Playing as Iceland
- ✅ Attempt to achieve the 'Perfect Circle' challenge by playing as Jarl Isleifur of Iceland in 1066.
- ✅ Found a new faith that allows and encourages incest.
- ✅ Proceed with sibling marriages over several generations, and various genetic traits such as giants and dwarves appear.
- ✅ Although the challenge was not achieved, the 'Kin' trait was obtained by having a child with the 'Inbred' trait, completing the 'Keep it in the Family' challenge.
15:31 - 15:58
9. 🤔 Conclusion: Crusader Kings 3 Underestimates the Dangers of Incest
- ✅ Crusader Kings 3 underestimates the dangers of incest, and in reality, genetic breakdown would proceed much faster.