19 September 1523 - Emperor Charles Quint and Henry VIII sign anti-French covenant
1551 – Birth of Henry III of France
1580 -The Treaty of Plessis-les-Tours was signed on September 29, 1580 between the Dutch Staten Generaal (with the exception of Zeeland and Holland) and François, Duke of Anjou (supported by William the Silent). Based on the terms of the treaty, François assumed the title of "Protector of the Liberty of the Netherlands" and became sovereign of the Dutch Republic. The accord was ratified at Bordeaux on January 23, 1581.When François attempted to take Antwerp in the French Fury in 17 January 1583, the citizens massacred his army. He withdrew from the Low Countries in June and died of malaria the following year.
1580 –Death of Catherine Willoughby, Duchess of Suffolk, suo jure 12th Baroness Willoughby de Eresby.She was the fourth wife of Charles Brandon, 1st Duke of Suffolk, who acted as her legal guardian during his third marriage to Mary Tudor, the younger sister of Henry VIII. Her second husband was Richard Bertie, a member of her household. Following Charles Brandon's death in 1545, it was rumoured that King Henry had considered marrying Catherine as his seventh wife, while he was still married to his sixth wife, Catherine Parr, who was Catherine's close friend.An outspoken supporter of the English Reformation, she fled abroad to Wesel and later Polish–Lithuanian Commonwealth during the reign of Queen Mary I, to avoid persecution.