The Third Lateran Council was an important assembly of the Roman Catholic Church held in 1179. Convened by Pope Alexander III, it aimed to address various issues within the Church, including clerical conduct and the need for reform. The council established rules for the election of popes, requiring a two-thirds majority among cardinals, to prevent disputes and ensure stability in leadership. Additionally, the council addressed the ongoing conflicts with the Cathars and other heretical groups, emphasizing the importance of maintaining doctrinal purity. It also reaffirmed the Church's stance on the importance of the sacraments and the role of bishops in guiding their communities.