On This Day in History: March 20 In 1345, scholars at the University of Paris believed that the conjunction of Mars, Jupiter and Saturn caused the Black Death. In reality, […], This day in history, what happened on this day. Calendar of events for every day. America, Asia, Europe, Africa events, On-This-Day.com - Today in History: Daily historical facts, events, famous birthdays, world history, United States history and music history., Explore fascinating historical events that happened on this day throughout time. Get daily historical insights delivered to your inbox., Today in History is everything that happened on this date in the areas of politics, war, science, music, sport, art, entertainment, and more., 312 28 Oct Constantine becomes the sole ruler of the Roman empire in the west with victory at the Milvian Bridge. 1918 28 Oct The German navy mutinies at Kiel rather than go into battle with the .