13 June

1983 - Pioneer 10 leaves the Solar System

On 13 June 1983, Pioneer 10 crossed Neptune's orbit, the first craft to leave the planetary zone.

1886 - Death of King Ludwig II of Bavaria

On 13 June 1886, King Ludwig II of Bavaria was found dead in mysterious circumstances.

1373 - Anglo-Portuguese Alliance

On 13 June 1373, the Anglo-Portuguese Alliance, the oldest alliance still in force, was sealed.