《太平广记·卷四百二十一·龙四》
我听说是被一个龙子偷去了，已将近四年了。他们的国君正用全国半年的税赋往回赎它。
吾闻为龙子所窃，已近四年，其君方以国中半年之赋召赎。
I heard that it was stolen by a dragon king, and it has been almost four years. Their king is offering half of the country's tax revenue for the year to redeem it.