Li Chenghong
... that Tang Dynasty imperial prince Li Chenghong carried the title of emperor for 12 days after invading Tufan forces captured the capital Chang'an and declared him emperor?
... that <a class="mw-redirect" href="./Tang_Dynasty" id="mwC4I" rel="mw:WikiLink" title="Tang Dynasty">Tang Dynasty</a> imperial prince <b id="mwC4M"><a href="./Li_Chenghong" id="mwC4Q" rel="mw:WikiLink" title="Li Chenghong">Li Chenghong</a></b> carried the title of emperor for 12 days after invading <a class="mw-disambig" href="./Tufan" id="mwC4U" rel="mw:WikiLink" title="Tufan">Tufan</a> forces captured the capital <a href="./Chang'an" id="mwC4Y" rel="mw:WikiLink" title="Chang'an">Chang'an</a> and declared him emperor?