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 Share On Facebook Share On Twitter 1825 Historical Events by Year 1827