子城与大城(或称罗城)相对,指中国古代城市中在主城内所修筑的小城(内城),或指主城所附的瓮城月城(城门外所筑用以屏蔽城门的半圆形小城),其中在旧志中记述城池建置沿革时,多以子城表述城中小城[1]。唐宋时的子城多为地方州府衙署所在,四周以城墙围绕,明清时则一般仅筑以围墙,不再修筑子城[2]。《资治通鉴·唐宪宗元和十四年》“比至,子城已洞开,惟牙城拒守”元胡三省注:“凡大城谓之罗城,小城谓之子城。又有第三重城,以卫节度使居宅,谓之牙城。”

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嘉兴子城城垣遗迹,子城周围二里十步,高厚均一丈二尺,对应的宋代罗城周围一十二里,高一丈二尺,厚一丈五尺。

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