Since the account in Daniel chapter 5 focuses on the events of the night of Babylon’s fall in 539 B.C.E., it does not relate how Belshazzar came to have regal authority.
اما منابع باستان‌شناسی به ما در مورد رابطهٔ بین بَلشَصَر و نَبونیدوس نظریه‌هایی می‌دهند .‏