The document discusses events that occurred in 480 BC, including the completion of the Imperial Treasury at the Persepolis Palace in Persia after three decades of construction. It also mentions wall paintings being started in the Tomb of the Lioness in Italy and notes that while the average life span was 28, it was 40 if a child survived past 10. Finally, it discusses King Leonidas leading 300 Spartans to defend Greece against King Xerxes' Persian invasion at the Gates of Fire.