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I Ibar, Saint Ibarra Ibagué Ibas Iberville, Pierre Le Moyne, Sieur d' Ibora Iceland Ichthys (Fish), Symbolism of the Iconoclasm Iconography, Christian Iconium Iconostasis Idaho Idatius of Lemica -- Chronicler and bishop (d. 468) Idea Idealism Ideas, Association of Idioms, Communication of Idiota Idolatry Idumea Iglesias, Diocese of Iglesias de la Casa, José Ignacio de Azevedo, Blessed Ignatius Loyola, Saint -- Founder of the Jesuits (1491-1556) Ignatius of Antioch, Saint -- Bishop of Antioch (d. c. 115) Ignatius of Constantinople, Saint -- Patriarch of Constantinople (799-877) Igneus, Blessed Peter Ignorance IHS Ildephonsus, Saint -- Archbishop of Toledo (d. 667) Illegitimacy Illinois Illinois Indians Illtyd, Saint -- Fifth-century Welsh saint Illuminated Manuscripts Illuminati -- Secret society founded in 1776 Illuminati -- False Spanish mystics Illuminative Way Illyria Iltutus, Saint Images, Veneration of Imagination Imbonati, Carlo Giuseppe Imhof, Maximus von Imitation of Christ Immaculate Conception Immaculate Conception, Congregation of the Immanence Immanuel Immortality Immunity Imola Imola, Innocenzo di Pietro Francucci da Impanation Impediments, Canonical Imperative, Categorical Imperfect Contrition Imposition of Hands Impostors Improperia In Commendam Incorporation of Church Property, Civil In Partibus Infidelium In Petto Incardination and Excardination Incarnate Word, Sisters of Charity of the Incarnate Word and Blessed Sacrament, Order of the Incarnation, The Incense Incest Inchbald, Elizabeth In Cœna Domini Index of Prohibited Books India Indiana Indianapolis Indian Missions, Bureau of Catholic Indians, American Indies, Patriarchate of the East Indifferentism, Religious Individualism Individual, Individuality Indo-China Induction Indulgences Indulgences, Apostolic Indult, Pontifical Ine, Saint Infallibility Infamy Infanticide Infessura, Stefano -- Lawyer and antipapal chronicler (1435-1500) Infidels Infinity Infralapsarians Ingen-Housz, Jan -- Scientist (1730-1799) Inghirami, Giovanni Ingleby, Venerable Francis Ingolstadt, University of Ingram, Venerable John Ingres, Jean-Auguste Dominique Ingulf Ingworth, Richard of Injustice Innocent I, Pope -- Reigned 401-417 Innocent II, Pope -- Reigned 1130-1143 Innocent III, Pope -- Reigned 1198-1216 Innocent IV, Pope -- Reigned 1243-1254 Innocent V, Blessed Pope -- Reigned 1276 Innocent VI, Pope -- Reigned 1352-1362 Innocent VII, Pope -- Reigned 1406 Innocent VIII, Pope -- Reigned 1484-1492 Innocent IX, Pope -- Reigned 1591 Innocent X, Pope -- Reigned 1644-1655 Innocent XI, Pope -- Reigned 1676-89 Innocent XII, Pope -- Reigned 1691-1700 Innocent XIII, Pope -- Reigned 1721-24 Innsbruck University Inquisition Inquisition, Canonical Insane, Asylums and Care for the Insanity Inscriptions, Early Christian Inspiration of the Bible Installation Instinct Institute of Mary Institute of Mission Helpers of the Sacred Heart Institute of the Blessed Virgin Mary, Irish Institute of the Brothers of the Christian Schools Institutes, Roman Historical Institution, Canonical Intellect Intendencia Oriental y Llanos de San Martín Intention Intercession Intercession, Episcopal Interdict Interest (in Psychology) Interest (in Economics) Interims Internuncio Introduction, Biblical Introit Intrusion Intuition Inventory of Church Property Investiture, Canonical Investitures, Conflict of Invincible Armada, The Invitatorium Iona, School of Ionian Islands Ionian School of Philosophy Ionopolis Iowa Ipolyi, Arnold Ippolito Galantini, Blessed Ipsus Ireland Ireland, Ven. William Irenaeus, Saint Irene, Sister Irenopolis Iriarte, Ignacio de Irish, The, (in countries other than Ireland) Irish College, in Rome Irish Colleges, on the Continent Irish Confessors and Martyrs Irish Literature Irnerius Iroquois Irregularity Irremovability Irvingites Isaac Isaac Jogues, Saint Isaac of Armenia Isaac of Nineveh Isaac of Seleucia Isabella I -- Queen of Castile (1451-1504) Isabel of France, Saint Isaias Isaura Ischia Isernia and Venafro Ishmael -- Son of Abraham and Hagar Isidore of Pelusium, Saint Isidore of Seville, Saint Isidore of Thessalonica Isidore the Labourer, Saint Isionda Isla, José Francisco de Islam (Concept) Islam (Religion) Isleta Pueblo Islip, Simon Ismael -- Son of Abraham and Hagar Ispahan Israelites Issachar Issus -- Titular see of Cilicia Prima Ita, Saint Italian Literature Italians in the United States Italo-Greeks Italy Ite Missa Est Itineraria Itinerarium Ittenbach, Franz Ives, Saint Ives, Levi Silliman Ivo of Chartres, Saint Ivory Ivrea, Diocese of Ixtlilxochitl, Fernando de Alba -- Mexican historian (1568-1648)