《元史·本纪·卷八》
初八，把平阴县的新镇寨改为肥城县，隶属于济宁府。
己卯，改平阴县新镇寨为肥城县，隶济宁府。
On the eighth day, the new Zhenzha of Pingyin County was renamed Feicheng County and was subordinated to Jining Prefecture.
<s>[INST] Convert the following English text into Classical Chinese: On the eighth day, the new Zhenzha of Pingyin County was renamed Feicheng County and was subordinated to Jining Prefecture. [/INST] 己卯，改平阴县新镇寨为肥城县，隶济宁府。</s>
Convert the following English text into Classical Chinese: On the eighth day, the new Zhenzha of Pingyin County was renamed Feicheng County and was subordinated to Jining Prefecture.
user
己卯，改平阴县新镇寨为肥城县，隶济宁府。
assistant