Exorcism
In Catholic practice the person performing the exorcism, known as an exorcist, is an ordained priest. The exorcist recites prayers according to the rubrics of the rite, and may make use of religious materials such as icons and sacramentals. The exorcist invokes God—specifically the Name of Jesus—as well as members of the Church Triumphant and the Archangel Michael to intervene with the exorcism. According to Catholic understanding, several weekly exorcisms over many years are sometimes required to expel a deeply entrenched demon.
Traité sur les apparitions des esprits et sur les vampires ou les revenans de Hongrie, de Moravie, &amp;c.
Calmet researched a judicial case that described the possession of Mademoiselle Elizabeth de Ranfaing, who having become a widow in 1617, was later sought in marriage by a physician (afterwards burned under judicial sentence for being a practicing magician). After being rejected, he gave her philters to make her love him which occasioned strange developments in her health and proceeded to continuously give her some other forms of medicament. The maladies which she suffered were incurable by the various physicians that attended her and eventually led to a recourse of exorcisms as prescribed by several physicians that examined her case. They began to exorcise her in September, 1619. During the exorcisms, the demon that possessed her made detailed and fluid responses in varying languages including French, Greek, Latin, Hebrew and Italian and was reportedly able to know and recite the thoughts and sins of various individuals who examined her. She was further also able to describe in detail with the use of various languages the rites and secrets of the church to experts in the languages she spoke. There was even a mention of how the demon interrupted an exorcist, who after making a mistake in his recital of an exorcism rite in Latin, corrected his speech and mocked him.