Apr 1 Samuel Morey is issued the first U.S. patent for an internal-combustion engine, which he calls a “Gas or Vapour Engine" Apr 10 10,500 inhabitants of the Greek town Messolonghi start leaving the town after a year's siege by Turkish forces. Very few of them survive. Apr 12 Weber's opera "Oberon" premieres in London Apr 23 Missolonghi, Greece captured by Turks 1825 Historical Events by Year 1827