《宋书·志·卷三十五》
东安太守，东安是旧县名，前汉时隶属城阳，后汉时隶属琅邪，《晋太康地志》记载隶属东莞，晋惠帝时分割塞差而设立。
东安太守，东安故县名，前汉属城阳，后汉属琅邪，《晋太康地志》属东莞，晋惠帝分东莞立。
Dong'an Prefect, Dong'an was the old county name. In the early Han Dynasty, it was under the jurisdiction of Chengyang. In the late Han Dynasty, it was under the jurisdiction of Langya. The "Geographical Records of Jintaikang" recorded that under the jurisdiction of Dongguan, it was divided and set up when Emperor Hui of Jin.