Ming official, first named 徐珵, who helped lead the 夺门之变 coup of 1457 that put the deposed Emperor Yingzong back on the throne. He also repaired breaks in the Yellow River dikes.
Xu Youzhen was a high-ranking official of the Ming dynasty.
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He took the name 有贞, 'having integrity', after his career stalled: as 徐珵 he had urged moving the capital south in the 1449 Tumu crisis and was mocked for it. After the 1457 coup he pressed for the execution of 于谦, who had defended Beijing in 1449.