Following the expansion of the Mongol Empire, the Turks were to a certain extent affiliated with the ruling nation. The social organization of Mongol and Turkish tribes was based upon clan customs, its inner ways and habits were regulated by customary law. In the 13 century, Chingis Kahn established the Yasa, or Code of Laws and Ordinances, which his successors continued to rule by. Although some scholars suspect Chingis Khan's Yasa only codified existing customary law others believe it served to supplement and fill any gaps left by customary law, especially in criminal law. According to fragments from the Egyptian Historian Ma?r?z?, sodomy was punishable by death as an offense against religion, morals, and established customs. Adultery was similarly defined as a crime punishable by death. Marriage was demarcated by a law that ordained "that the man should buy his wife" and hence prescribed strict gender roles on family operation. Makrizi, sodomy was punishable by death as an offense against religion, morals, and established customs. Adultery was similarly defined as a crime punishable by death. Marriage was demarcated by a law that ordained "that the man should buy his wife" and hence prescribed strict gender roles on family operation.