Sergius IV was a pope who served from 1009 to 1012. He was born as Pietro and became the 145th pope of the Roman Catholic Church. His papacy was marked by efforts to strengthen the church's authority and address various issues within the Christian community. During his time as pope, Sergius IV faced challenges from local powers and worked to maintain peace in Rome. He is remembered for his contributions to the church and his attempts to promote stability in a period marked by political turmoil. His reign was relatively short but significant in the context of early medieval papacy.