in Rome. The Jianwu era of the Eastern Han Dynasty (25-56 A.D.)   changes to the Jianwuzhongyuan era (56-58 A.D.). 79) At Age 56 : Julius Caesar (100 BC-44 BC) assassinated on the Ides of March (March 15, 44 BC). William Gilbert (1544-1603) publishes Of the Magnet and Magnetic Bodies (1600),