Answer
Pope Victor II, originally Gebhard of Dollnstein-Hirschberg, passed away on July 28, 1057. He assumed the papacy in 1055 and played a pivotal role in the Investiture Controversy, the power struggle between the Holy Roman Emperors and the papacy over the right to appoint bishops, aiming to enforce papal supremacy. His efforts significantly influenced the course of church-state relations in medieval Europe.