Yasa

…had, in any event, the yāsā, or tribal law, of Genghis Khan to apply as the law of the Mongol state, in opposition to, or side by side with, the sharia, the law of Islam.

…Khan and known as the Yasa, which served to regulate personal status and criminal liability among the Mongol elite, as did the Sharīʿah among Muslims. In Il-Khanid hands, this dynastic law merely coexisted but did not compete with Sharīʿah; but in later Turkic regimes a reconciliation was achieved that extended…