Ladislaus II
During the rule of Géza II, Stephen IV and Ladislaus II were not satisfied with their titles and possessions, so they sought help with the Holy Roman Emperors and Byzantine Emperors. The plots against Géza II had no success, and after his death (1161) Manuel I Komnenos saw a good opportunity to expand Byzantine influence in Hungary. Manuel helped to dethrone Stephen III, son of Géza II, and place firstly Ladislaus II and then Stephen IV for a short time. Finally, Stephen III secured the throne in 1163. Queen Helena is believed to have died in 1161.