Why did the Gregorian Reform start?

The Gregorian Reform, initiated in the late 11th century under Pope Gregory VII, aimed to address corruption and abuses within the Church, particularly the practice of simony (the selling of church offices) and lay investiture, where secular leaders appointed bishops. This movement sought to restore the spiritual authority of the papacy and improve the moral integrity of the clergy. The reform was also fueled by a desire to assert the independence of the Church from secular powers, emphasizing the need for a unified and morally upright Church. Ultimately, it set the stage for significant conflicts between popes and kings, shaping the future relationship between church and state.