Pope Gregory X, born Teobaldo Visconti in 1210, served as the head of the Roman Catholic Church from 1271 until his death in 1276. He is best known for his efforts to reform the church and improve its governance. Gregory X convened the Second Council of Lyon in 1274, which aimed to address issues such as clerical corruption and the relationship between the church and secular authorities. During his papacy, Gregory X also focused on promoting peace in Europe and fostering unity among Christians. He sought to revive the Crusades to the Holy Land, emphasizing the importance of Christian unity in the face of external threats. His leadership was marked by a commitment to both spiritual and administrative reforms.