January 21, 1525: Conrad Grebel (Ulrich Zwingli's former protege) rebaptizes George Blaurock, a former monk, in a secret, illegal meeting of six men in Zurich. This meeting is now considered the birth of the Anabaptist movement (see issue 5: Anabaptists).
January 21, 1549: In the first of four Acts of Uniformity, the English Parliament requires all Anglican public services to exclusively use of The Book of Common Prayer.
January 21, 1621: Pilgrims leave the Mayflower and gather on shore at Plymouth, Massachusetts, for their first religious service in America (see issue 41: The American Puritans).
February 21, 1109: Anselm, the Archbishop of Canterbury recognized as the "founder of Scholasticism," dies. One of the most profound thinkers of the Middle Ages, his treatise Why Did God Become Man was the greatest medieval treatise on the atonement. He is also known for his ontological argument for the existence of God.
February 21, 1142: Medieval French philosopher, teacher, and theologian Peter Abelard dies. Perhaps best known for his (chaste) love affair with nun Heloise, Abelard made ...