《宋书·本纪·卷三》
各郡县的名称中凡加了 北 字的一律去掉；侨立在南方的，准许以 南 为名。
诸旧郡县以北为名者，悉除；寓方于南者，听以南为号。
The word 北 should be removed from the names of all the counties; those established in the south are allowed to take 南 as their name.