Pei Ju
Also in 593, knowing that the Princess Dayi was still resentful of him, Emperor Wen had the official Pei Ju inform the cousin and subordinate khan to the Göktürks' Dulan Khan, Ashina Yongyulü, the Tuli Khan Ashina Rangan (son of Ashina Chuluohou) that he would let Ashina Rangan marry a Sui princess if Ashina Rangan was able to get Princess Dayi killed. Ashina Rangan, in response, accused Princess Dayi of adultery, and Ashina Yongyulü killed her and requested another marriage with Sui. Instead, Emperor Wen agreed to marry a princess to Ashina Rangan, in order to create greater friction between them.