Society of the Mongol Empire dowry of clothing or household ornaments" to the groom's mother. To avoid paying the dowry, families could exchange daughters or the groom could work for his future father-in-law. Once the dowry was settled, the bride's family presented her with an inheritance of livestock or servants. Typically, married women of the Mongol Empire wore headdresses to distinguish themselves from the unmarried women. It is claimed that the Yassa/Zasag prohibited trade in women. Marriages in the Mongol Empire were arranged, however Genghis Khan´s later nokoger (literally "women friends" but seen as wives usually and later) and those of his officers were not
Mongol invasions of Vietnam repeatedly ignored demands to attend the Yuan court and offer his personal submission to the Great Khan. By 1266, a standoff developed, as the Emperor Thánh Tông sought a loose tributary relationship, while Kublai demanded full submission. Trần Thánh Tông sent an official letter requiring Kublai to take his darughachi back. Because of civil war in the Mongol Empire, and the Yuan conquest of Song China, armed conflict was delayed. Instead, Kublai reminded him of the peace treaty signed by the Mongols and Đại Việt. As a result of the Mongol conquest of the Song Empire, by 1278–79, Mongol troops