Late-Eastern-Hàn philologist and lexicographer, zì Chéngguó 成國, of Běihǎi 北海. Conventionally dated to c. 200 CE on internal evidence in his sole surviving work, the Shìmíng 釋名 KR1j0007. The HòuHànshū gives him no biography. He is associated by tradition with the late-Hàn / early-Three-Kingdoms generation of xiǎoxué scholars whose work culminates in Xǔ Shèn’s 許愼 Shuōwén jiězì and Zhāng Yī’s 張揖 Guǎngyǎ. The Wú-state scholar Wéi Zhāo 韋昭 wrote a lost critique BiànShìmíng 辨釋名, fragments of which survive in citation. A homonymous Liú Zhēn 劉珍 (also of late Hàn) is reported in the HòuHànshū to have composed an unrelated Shìmíng in 50 piān, long lost; Sìkù compilers explicitly distinguish the two.