 In 648, while accompanying Emperor Taizong at Yuhua Palace (玉華宮, in modern Tongchuan, Shaanxi), Xiao grew ill and died.The ministry of ceremonies suggested, as a posthumous name, De (德, meaning "virtuous"), while the executive bureau suggested Su (肅, meaning, "solemn").Emperor Taizong, however, disagreed with both, stating that posthumous names should be particularly reflective of people's characters, and he chose Zhenbian (貞褊, meaning "honest but harsh") instead.