易县 / Yi County (Late Han)
易县 / Yi County (Late Han) enters the wiki through Hanji 998 as the place 公孙瓒 chooses after hearing a children’s song about a refuge near the Yan-Zhao border. He interprets the song as pointing to Yi County and moves his headquarters there.
The episode’s Yi County matters because it becomes the setting for 易京, Gongsun Zan’s deep-trenched and towered stronghold. The move represents a strategic and psychological retreat from campaigning into defensive enclosure.