Su Wu was a Chinese diplomat sent to negotiate with the Xiongnu nomads around 100 BCE. When talks went south, the Xiongnu captured him and demanded he renounce his loyalty to the Han Dynasty. Su Wu refused.
As punishment, they exiled him to the frozen wasteland of Lake Baikal to herd sheep — basically a death sentence disguised as a job. For nineteen brutal years, he survived on grass, roots, and whatever scraps he could find. The Xiongnu kept offering him wealth and status if he'd just switch sides, but Su Wu held onto his Han banner until it fell apart.
His only companions were the sheep he tended. Eventually, the Han and Xiongnu made peace, and Su Wu finally returned home as a hero. The story became legendary — the ultimate example of staying true to your principles even when it costs you everything.