对立教皇维克多四世
Victor IV (born Octavian or Octavianus: Ottaviano dei Crescenzi Ottaviani di Monticelli) (1095 – 20 April 1164) was elected as a Ghibelline antipope in 1159, following the death of Pope Adrian IV and the election of Alexander III.他的选举得到了弗雷德里克巴巴罗萨的支持。他取名为维克多四世，不考虑 1138 年的对立教皇维克多四世，后者担任教皇职务被认为是非法的。