Today in History is everything that happened on this day in history—in the areas of politics, war, science, music, sport, art, entertainment, and more., 1509 – An earthquake known as " The Lesser Judgment Day " hit Constantinople. 1622 – Fifty-five Christians were executed in Nagasaki during the Great Genna Martyrdom, part of persecution towards Christians in Japan by the Tokugawa shogunate., Discover what happened on this day in history. Explore major events, famous births, and unforgettable moments from past eras!, 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, […], Discover what happened on this day in history with key events, facts, and milestones that shaped the world. Stay informed with daily historical insights., Daily updates of key historical events and dates..