The Yassa laws were the laws of the Mongol Empire under the rule of Genghis
Khan. After Genghis
Khan died, the laws were still enforced, however it is unclear how strictly and to what extent. The Yassa are also referred to as Genghis
Khan'
s laws.
You can read more about the Yassa laws here: Genghis Khan's laws
The Yassa were based around obedience to Genghis Khan, a uniting together of the Mongol nomad clans, and the strict punishment of wrongdoing.
The Yassa laws prescribed the death penalty for things like homosexuality, adultery, spying on the Mongol Empire, stealing a
horse, and unlawful pillaging.