徐无山 / Xu Wu Mountain
徐无山 / Xu Wu Mountain enters through Hanji 972 as the mountain refuge where 田筹 turns loyalty to 刘虞 into local order. Tian Chou brings followers from 无终县, finds flat land in a deep mountain setting, farms personally, and attracts thousands of households.
The source makes Xu Wu Mountain more than a hiding place. Tian Chou establishes rules for killing, injury, theft, and disputes, adds marriage rites and schooling, and manages relations with 乌桓 and other frontier groups through respect and reassurance. The result is a small frontier order built by law and reputation rather than formal office alone.