History Trivia - Constantinople dedicated new capital of Roman Empire

May 11

 330 Constantinople was dedicated as the new capital of the Roman Empire during the reign of Constantine the Great

History Trivia - Constantine the Great receives Vision of the Cross.

October 27

312 Constantine the Great is said to have received his famous Vision of the Cross. 

939 Athelstan died. Athelstan was the first West Saxon king to have effective rule over the whole of England. He was succeeded by Edmund I as King of England.

 1401 Catherine of Valois was born. The neglected daughter of King Charles VI of France, Catherine married King Henry V of England and gave birth to his son, Henry VI. After her husband's untimely death, she began a relationship with Owen Tudor, and married him in secret. One of their sons was the father of King Henry VII. 

. 

History Trivia - Marcus Nerva proclaimed Roman Emperor

Sept 18

53 Roman Emperor Trajan was born.

96 Marcus Nerva was proclaimed Roman Emperor after Domitian was assassinated.

324 Constantine the Great decisively defeated Licinius in the Battle of Chrysopolis, establishing Constantine's sole control over the Roman Empire.

1180 Philip Augustus became king of France. Philip was one of the most successful medieval French monarchs in expanding the royal demesne and the influence of the monarchy. He broke up the great Angevin Empire (an area stretching from the Pyrenees to Ireland ruled by the Angevin Plantagenet dynasty during the 12th and early 13th centuries) and defeated a coalition of his rivals (German, Flemish and English) at the Battle of Bouvines in 1214.