pope of the Catholic Church from 1455 to 1458 from the Borgia family
Pope Callixtus III (31 December 1378 – 6 August 1458), also known as Alfonso de Borgia), was head of the Catholic Church and ruler of the Papal States from 8 April 1455 to his death in 1458. He is the most recent pope to have taken the pontifical name of "Callixtus" upon his election. He was also responsible for the retrial of Joan of Arc that saw her vindicated. A member of the powerful Borgia family, Callixtus III was the uncle of Pope Alexander VI, whom he appointed to the College of Cardinals.
From: Wikiquote (CC BY-SA 4.0)
From Wikidata (CC0)
I, Pope Calixtus III, promise and vow to the Holy Trinity, Father, Son, and Holy Ghost, to the Ever-Virgin Mother of God, to the Holy Apostles Peter and Paul, and to all the heavenly host, that I will do everything in my power, even, if need be, with the sacrifice of my life, aided by the counsel of my worthy brethren, to reconquer Constantinople, which in punishment for the sin of man has been taken and ruined by Mahomet II, the son of the devil and the enemy of our Crucified Redeemer. Further, I vow to deliver the Christians languishing in slavery, to exalt the true Faith and to extirpate the diabolical sect of the reprobate and faithless Mahomet in the East. For there the light of Faith is almost completely extinguished. If I forget thee, O Jerusalem, let my right hand be forgotten. Let my tongue cleave to my jaws, if I do not remember thee. If I make not Jerusalem the beginning of my joy, God and His holy Gospel help me. Amen.