桂阳郡 / Guiyang Commandery (late Han)
桂阳郡 / Guiyang Commandery enters the wiki through Hanji 1027 as the third commandery in the southern Jingzhou alignment that 桓阶 recommends to 张献. It appears as part of a regional structure rather than as a separately narrated commandery.
In the source, Guiyang helps make the breakaway large enough to matter. Together with 长沙郡 and 零陵郡, it represents nearly half the source’s stated Jingzhou commandery field, so its movement toward 曹操 turns southern local discontent into a constraint on 刘表.