Mertcan Bulak

The curriculum of the cathedral school was limited to grammar, rhetoric, logic, arithmetic, geometry, music, and astronomy—the seven liberal arts, so called because in ancient Rome their study had been reserved for liberi , “freemen.”
Etimoloji Defteri
Mücellit Nedir ?
In England, King John differed with Innocent over the election of the archbishop of Canterbury, and Innocent placed England under interdict and excommunicated John. Under attack from his barons, John capitulated to Innocent by becoming his vassal, receiving England back as a fief, and paying him a sizable annual tribute. In France, Innocent forced King Philip Augustus to comply with the church’s moral code by taking back as his queen the woman he had divorced with the consent of the French bishops. And within the Holy Roman Empire (Germany), Innocent intervened in a civil war between rival candidates for the throne, supporting first one, then the other. In the end Innocent secured the election of his ward, the young Hohenstaufen heir Frederick II, who promised to respect papal rights and to go on a crusade.
The second weapon in the papal arsenal was the interdict. While excommunication was aimed at individuals, the interdict fell upon whole nations. It suspended all public worship and, with the exception of baptism and extreme unction, it withdrew the sacraments from the lands of disobedient rulers. Pope Innocent III successfully applied or threatened the interdict eighty-five times against uncooperative princes.
Thus the pope’s first weapon in bringing peasants and princes to their knees was the threat of excommunication. He could pronounce their anathema and they would be “set apart” from the church, deprived of the grace essential for salvation. After some bishop read the solemn sentence of excommunication, a bell rang as for a funeral, a book was closed, and a candle was extinguished, all to symbolize the cutting off of the guilty man. If he entered a church during mass he was expelled or the mass was halted.
The problem of lay investiture was settled in 1122 by the compromise known as the Concordat of Worms. The church maintained the right to elect the holder of an ecclesiastical office, but only in the presence of the emperor or his representative.