Vast numbers of contract tablets, dated to the reigns of Hammurabi and his successors, have been discovered, as well as 55 of his own letters. These letters give a glimpse into the daily trials of ruling an empire, from dealing with floods and mandating changes to a flawed calendar, to taking care of Babylon's massive herds of livestock. Hammurabi died and passed the reins of the empire on to his son Samsu-iluna in , under whose rule the Babylonian empire quickly began to unravel.