Year 1509 (MDIX) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. Events of 1509 January – June February 2 – Battle of Diu: The Portuguese defeat a coalition of Indians, Muslims and Italians. April 21 – Henry VIII becomes King of England (for 38 years) on the death of his father, Henry VII. April 27 – Pope Julius II places Venice under interdict and excommunication for refusing to cede part of Romagna to papal contro… (More on 1509)