1850th anniversary
June 165 AD - Justin Martyr, the Christian Apologist, was believed to have been martyred for his faith on this date.
800th anniversary
November 1215 - The fourth Lateran Council was convoked. It promulgated the the doctrine of Transubstantiation which claims that the substance of the bread and wine become the body and blood of Christ, with only the appearances of bread and wine remaining. Thomas Aquinas later expanded upon this doctrine firmly establishing it as part of Romish teaching.
