<a href="./?mention=郑国">郑国</a>,隋末政权,<a href="./?mention=王世充">王世充</a>建立。唐<a href="./?mention=武德">武德</a>二年(619)四月,世充废<a href="./?mention=皇泰主">皇泰主</a>,称帝即位,建元<a href="./?mention=开明">开明</a>,<a href="./?mention=国号">国号</a>郑。<a href="./?mention=王世充">王世充</a>即位后,当了一阵好皇帝,遂即占领<a href="./?mention=豫州">豫州</a>。三年,<a href="./?mention=唐高祖李渊">唐高祖李渊</a>遣秦王<a href="./?mention=李世民">李世民</a>攻郑,进逼<a href="./?mention=东都">东都</a>,世充乞援于夏主<a href="./?mention=窦建德">窦建德</a>。四年五月,<a href="./?mention=李世民">李世民</a>败<a href="./?mention=夏军">夏军</a>于<a href="./?mention=虎牢">虎牢</a>(今河南<a href="./?mention=荥阳">荥阳</a>西北),<a href="./?mention=建德">建德</a>被俘,世充以<a href="./?mention=洛阳">洛阳</a>降,郑亡。