太延
太延-
按照史家的习惯，北魏统一北方的太延五年（439）往往被视为北朝的起始之年。
Historians often regard the 5th year of Taiyan ( 439 ) , when the Northern Wei unified the northern area of China , as the beginning of the Northern Dynasty .
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北魏太武帝太延五年（439）废县，设榆中镇。
So too the Northern Wei Dynasty Emperor five-year extension ( 439 ) Waste County , located in Yuzhong town .