Ancient World Timeline By hm20032 3000 BCE Sumerians have ploughs, ships and gold. 2700 BCE 365 day year invented in Egypt 2600 BCE Stonehenge built in Britain 2584 BCE Building the Pyramids begins in Egypt 1260 BCE Siege of Troy 508 BCE Democracy invented in Athens (Ancient Greece) 480 BCE Battle of Thermopylae (basis for the movie 300) 447 BCE Parthenon built in Athens