|AD 325, a council of bishops called by Constantine to obtain agreement on various aspects of Christianity (e.g., the Trinity) and to end heresies (e.g., Arianism).
|AD 325, a council of bishops called by Constantine to obtain agreement on various aspects of Christianity (e.g., the Trinity) and to end heresies (e.g., Arianism).
+
|-
+
|[[Crusades]]
+
|(AD 1099-1204): a series of four major military expeditions by Christians to free Jerusalem and make it safe for pilgrimages, beginning with the successful First Crusade but later including the looting of Constantinople during the Fourth Crusade.