Pope Sergius IV died on 1012-05-12.
Sergius IV of Naples died in 1036.
Pope Sergius II died on 847-01-24.
Pope Sergius III died on 0911-04-14.
Pope Leo IV was elected pope after Sergius II. Leo IV was made pope on April 10 847 and he reigned until his death on July 17th 855 AD. Leo reigned in difficult times as the Saracens were invading Europe and political ties were high with tension. Leo's ability and sanctity in facing these trials was such that he was canonized by the Church and is reverenced by the faithful as Saint Leo IV.
Pope Anastasius III reigned after Sergius III from April 911 until June 913.
Pope Felix IV died in 530.
Pope Cyril IV of Alexandria died in 1861.
Pope Leo IV died on 855-07-17.
Pope John IV died on 642-10-12.
Pope Urban IV died on 1264-10-02.
Pope Stephen IV died on 817-01-24.
Pope Martin IV died on 1285-03-28.