 Later, Yuwen Huaji, unable to prevail over Li Mi, crossed the Yellow River north to Wei (魏縣, in modern Handan), Yuwen Shiji suggested that he head west and submit to Tang.Yuwen Huaji refused, and instead poisoned Yang Hao and declared himself emperor of a new state of Xu.He created Yuwen Shiji the Prince of Shu (蜀王).