Why was the Papacy slow to call for a council to address the rise of Protestantism?

Why was the Papacy slow to call for a council to address the rise of Protestantism? What role did Pope Paul III play in the Catholic Reformation and the Council of Trent? What were the goals of the COuncil? What reforms were ped by the Council in 1562 and 1563? What major Catholic doctrines were reaffirmed by the Council of Trent? Who held supreme power in the Catholic Church after the COuncil of Trent? What was the end result of the Council?