who declared that every creature is subject to the pope for salvation
Unam sanctam On 18 November 1302, Pope Boniface VIII issued the papal bull Unam sanctam[a] which some historians[1] consider one of the most extreme statements of papal spiritual supremacy ever made.[not in citation given (See discussion.)] The original document is lost but a version of the text can be found in the registers of Boniface VIII in the Vatican Archives.[2] The Bull lays down dogmatic propositions on the unity of the Catholic Church, the necessity of belonging to it for eternal salvation, the position of the pope as supreme head of the Church, and the duty thence arising of submission to the pope in order to belong to the Church and thus to attain salvation. The pope further emphasizes the higher position of the spiritual in comparison with the secular order.
Pope The word pope derives from Greek πάππας meaning "father". In the early centuries of Christianity, this title was applied, especially in the east, to all bishops[18] and other senior clergy, and later became reserved in the west to the Bishop of Rome, a reservation made official only in the 11th century.[19][20][21][22][23] The earliest record of the use of this title was in regard to the by then deceased Patriarch of Alexandria, Pope Heraclas of Alexandria (232–248).[24] The earliest recorded use of the title "pope" in English dates to the mid-10th century, when it was used in reference to Pope Vitalian in an Old English translation of Bede's Historia ecclesiastica gentis Anglorum.[25]