Johannes Hymonides, known as John the Deacon of Rome (d. between 876 and 882), was a deacon of the Roman Church.
 Few details are known of his life: after the death of St Nicholas I, he was briefly exiled from Rome at the behest of the emperor Louis II, but was recalled by Adrian II.
 Possessed of considerable learning, he was closely associated with Anastasius, Librarian of the Roman Church (died 879).
Malachi Brendan Martin (Irish: "Maolsheachlainn Breandán Ó Máirtín"; July 23, 1921 – July 27, 1999), occasionally writing under the pseudonym Michael Serafian, was an Irish Catholic priest and writer on the Catholic Church.
 Originally ordained as a Jesuit priest, he became Professor of Palaeography at the Vatican's Pontifical Biblical Institute.
 From 1958 he served as secretary to Cardinal Bea during preparations for the Second Vatican Council.
The Banner of the Holy Roman Church (Latin: "Vexillum"; Italian: "Gonfalone di Santa Romana Chiesa", occasionally "Vessilio di San Pietro", "Standard of St. Peter") was the battle standard of the Papal States during the Renaissance and a symbol of the Roman Catholic Church.
 The office of the Gonfalonier of the Church was originally intended to function as its bearer.
The Liber Censuum Romanæ Ecclesiæ (Latin for "Census Book of the Roman Church"; also referred to as the Codex of Cencius) is an eighteen-volume (originally) financial record of the real estate revenues of the papacy from 492 to 1192.
 The span of the record includes the creation of the Apostolic Camera and the effects of the Gregorian Reform.
 The work constitutes the "latest and most authoritative of a series of attempts, starting in the eleventh century, to keep an accurate record of the financial claims of the Roman church".
 According to historian J. Rousset de Pina, the book was "the most effective instrument and [...] the most significant document of ecclesiastical centralization" in the central Middle Ages.
Carlo Rezzonico (25 April 1724 – 26 January 1799) was a cardinal of the Roman Catholic Church.
 He is sometimes referred to as "The Younger" to distinguish him from his uncle Pope Clement XIII who also bore the name "Carlo Rezzonico".
 He served as Vice-Chancellor of the Holy Roman Church (1758–1763), Camerlengo of the Holy Roman Church (1763–1799) and Secretary of the Roman Inquisition (1777–1799).
 He was also bishop of Sabina (1773–1776) and Bishop of Porto e Santa Rufina (1776–1799).
 As Cardinal Camerlengo he participated in the papal conclave, 1769 and papal conclave, 1774-1775.
A slow movement is a form in a multi-movement musical piece.
 Generally, the second movement of a piece will be written as a slow movement, although composers occasionally write other movements as a slow movement as well.
 The tempo of a slow movement can vary from largo to andante.
 It is usually in the dominant, subdominant, parallel, or relative key of the musical work's main key.
David Chapman (born April 1, 1976) is an entertainment writer/producer covering various pop culture interests, particularly the video game and comic book industries.
 Chapman's freelance work has appeared in a variety of outlets, including "GameSpy" and the US version of "Play Magazine".
 Chapman produced a number of segments for the video game television show "The Electric Playground", including most of the show's popular " 'Comic of the Week' " segments, and continues to occasionally write and produce content for the show and its website.
 Chapman was the News Editor for the video game website, Game Almighty, and has been a regular writer for TeamXbox, GameSpy, and Crispy Gamer.
 Chapman also wrote regular weekly articles for USA Network's Character Arcade, covering the interactive entertainment industry and writing monthly "Character Spotlight" articles showcasing biographies of various video game characters.
The Decline and Fall of the Roman Church is a 1981 non-fiction book by Catholic priest and author Malachi Martin.
Holy Roman Church, Roman Church, or Church of Rome may, in modern contexts, mean:
He was made cardinal on 19 September 1431 by his uncle, Pope Eugenius IV, and accumulated many offices and dignities.
 He was Camerlengo of the Holy Roman Church (1432–40), administrator of Narbonne (1433–36) and Amiens (1436–37).
 He was Archbishop of Besançon (1437–38) and Archbishop of Verona (1438–53), Vice-Chancellor of the Holy Roman Church (1437–53), Latin Patriarch of Constantinople (1438–53), and bishop of the suburbicarian see of Porto (1445–53).
 He was sometimes referred to as the Cardinal of Venice.

Question: Under what pseudonym did the author of the book The Decline and Fall of the Roman Church occasionally write ?
Answer: Michael Serafian