Sino-Xiongnu War
... that during the Sino-Xiongnu War, the Han empire attempted alliance with a people whose king's skull the Xiongnu had made into a drinking cup?
... that during the <b id="mwAak"><a class="mw-redirect" href="./Sino-Xiongnu_War" id="mwAao" rel="mw:WikiLink" title="Sino-Xiongnu War">Sino-Xiongnu War</a></b>, the <a class="mw-redirect" href="./Han_Dynasty" id="mwAas" rel="mw:WikiLink" title="Han Dynasty">Han empire</a> attempted alliance with <a href="./Yuezhi" id="mwAaw" rel="mw:WikiLink" title="Yuezhi">a people</a> whose king's skull the <a href="./Xiongnu" id="mwAa0" rel="mw:WikiLink" title="Xiongnu">Xiongnu</a> had made into a drinking cup?