
Han envoy held captive by Xiongnu for 19 years.
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Su Wu was sent as a Han envoy to the Xiongnu. When a subordinate was implicated in a plot against the Xiongnu Chanyu, Su Wu was arrested and held captive. He refused to surrender, attempting suicide by stabbing himself.
After refusing to surrender, Su Wu was exiled to the shores of Lake Baikal to herd sheep. The Xiongnu told him he could return only when the rams gave birth, a condition meant to be impossible. He survived on wild plants and roots.
After 19 years in captivity, Su Wu was released following a Han diplomatic mission that negotiated his return. He was welcomed back to Chang'an as a symbol of loyalty and integrity, receiving honors from Emperor Zhao of Han.
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