Subcategories - Christianity, Christians, Churches
- Increase Mather
- Indian-white relations: Spanish colonial
- Innocent III
- Innocent IV
- Ivan III’s Organization of the “Third Rome”
- Jacques Maritain
- James Gibbons
- James I the Conqueror
- Jan Hus
- Jean de Venette
- Jesus
- Joachim of Fiore
- Joan of Arc
- John Bunyan
- John Calvin
- John Colet
- John Henry Newman
- John III Sobieski
- John Knox
- John of Damascus
- John Paul II
- John R. Mott
- John Slocum
- John the Apostle
- John Wesley
- John Wyclif
- John Wycliffe Is Condemned for Attacking Church Authority
- John XXIII
- Joseph Butler
- Joseph Smith
- Julius II
- Kansas Outlaws Teaching of Evolution in Schools
- Kateri Tekakwitha
- The King James Bible Is Published
- Kingdoms of Castile and León Are Unified
- Knights of the Fourth Crusade Capture Constantinople
- Lancelot Andrewes
- Latin Empire-Byzantine Wars
- Leo IX
- Leo X
- Leo XIII
- Lord Acton
- Louis IX
- Luther Posts His Ninety-five Theses
- Martin Bucer
- Martin Luther
- Martin Luther Appears Before the Diet of Worms
- Martin Niemöller
- Mary
- Mary Baker Eddy
