Xiongnu
Marriage diplomacy with Han dynasty

In the winter of 200 BC, following a Xiongnu siege of Taiyuan, Emperor Gaozu of Han personally led a military campaign against Modu Chanyu. At the Battle of Baideng, he was ambushed, reputedly by Xiongnu cavalry. The emperor was cut off from supplies and reinforcements for seven days, only narrowly escaping capture.

The Han dynasty sent random unrelated commoner women falsely labeled as "princesses" and members of the Han imperial family multiple times when they were practicing Heqin marriage alliances with the Xiongnu in order to avoid sending the emperor's daughters. The Han sent these "princesses" to marry Xiongnu leaders in their efforts to stop the border raids. Along with arranged marriages, the Han sent gifts to bribe the Xiongnu to stop attacking. After the defeat at Pingcheng in 200 BC, the Han emperor abandoned a military solution to the Xiongnu threat. Instead, in 198 BC , the courtier Liu Jing was dispatched for negotiations. The peace settlement eventually reached between the parties included a Han princess given in marriage to the chanyu (called heqin) (Chinese: 和親; lit. ' harmonious kinship '); periodic gifts to the Xiongnu of silk, distilled beverages and rice; equal status between the states; and a boundary wall as mutual border.

This first treaty set the pattern for relations between the Han and the Xiongnu for sixty years. Up to 135 BC, the treaty was renewed nine times, each time with an increase in the "gifts" to the Xiongnu Empire. In 192 BC, Modun even asked for the hand of Emperor Gaozu of Han widow Empress Lü Zhi. His son and successor, the energetic Jiyu, known as the Laoshang Chanyu, continued his father's expansionist policies. Laoshang succeeded in negotiating with Emperor Wen terms for the maintenance of a large scale government sponsored market system.

While the Xiongnu benefited handsomely, from the Chinese perspective marriage treaties were costly, very humiliating and ineffective. Laoshang Chanyu showed that he did not take the peace treaty seriously. On one occasion his scouts penetrated to a point near Chang'an. In 166 BC he personally led 140,000 cavalry to invade Anding, reaching as far as the imperial retreat at Yong. In 158 BC, his successor sent 30,000 cavalry to attack Shangdang and another 30,000 to Yunzhong.

The Xiongnu also practiced marriage alliances with Han dynasty officers and officials who defected to their side by marrying off sisters and daughters of the Chanyu (the Xiongnu ruler) to Han Chinese who joined the Xiongnu and Xiongnu in Han service. The daughter of the Laoshang Chanyu (and older sister of Junchen Chanyu and Yizhixie Chanyu) was married to the Xiongnu General Zhao Xin, the Marquis of Xi who was serving the Han dynasty. The daughter of Qiedihou Chanyu was married to the Han Chinese General Li Ling after he surrendered and defected. Another Han Chinese General who defected to the Xiongnu was Li Guangli, general in the War of the Heavenly Horses, who also married a daughter of the Hulugu Chanyu. The Han Chinese diplomat Su Wu married a Xiongnu woman given by Li Ling when he was arrested and taken captive. Han Chinese explorer Zhang Qian married a Xiongnu woman and had a child with her when he was taken captive by the Xiongnu.

The Yenisei Kyrgyz khagans of the Yenisei Kyrgyz Khaganate claimed descent from the Chinese general Li Ling, grandson of the famous Han dynasty general Li Guang. Li Ling was captured by the Xiongnu and defected in the first century BCE. And since the Tang royal Li family also claimed descent from Li Guang, the Kirghiz Khagan was therefore recognized as a member of the Tang Imperial family. This relationship soothed the relationship when Kyrgyz khagan Are (阿熱) invaded Uyghur Khaganate and put Qasar Qaghan to the sword. The news brought to Chang'an by Kyrgyz ambassador Zhuwu Hesu (註吾合素).
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