The royal family of the Mongol Empire owned the largest appanages in the world because of their enormous empire. In 1206, Genghis Khan awarded large tracts of land to his family members and loyal companions, most of whom were of common origin. Shares of booty were distributed much more widely. Empresses, princesses, and meritorious servants, as well as children of concubines, all received full shares including war prisoners. For example, Kublai summoned two siege engineers from the Ilkhanate, and after their success rewarded them with lands. After the Mongol conquest in 1238, the port cities in Crimea paid the Jochids custom duties and the revenues were divided among all Chingisid princes in Mongol Empire in accordance with the appanage system. As loyal allies, the Kublaids in East Asia and the Ilkhanids in Persia sent clerics, doctors, artisans, scholars, engineers and administrators to and received revenues from the appanages in each other's khanates.