Was Belshazzar in the Book of Daniel a real person?

Who was King Belshazzar and did he exist? The Bible says that he was King of the Babylonian Empire. He famously saw a hand write words on a wall: “King Belshazzar gave a great banquet for a thousand of his nobles and drank wine with them…Suddenly the fingers of a human hand appeared and wrote on the plaster of the wall, near the lampstand in the royal palace. The King watched the hand as it wrote…That very night Belshazzar, King of the Babylonians, was slain,  and Darius the Mede took over the kingdom, at the age of sixty-two.” Daniel 5.

For many years, people believed that Belshazzar was a myth. A clay cylinder with cuneiform writing on it was found in the 1800s and was eventually translated by Pail Alain Beaulieu in 1989. Part of the translation reads, “As for me, Nabonidus, king of Babylon, save me from sinning…, and as for Belshazzar, the eldest son -my offspring- instill reverence for your great godhead in his heart…”  

Nabonidus is a known historical figure. Belshazzar was co-regent of Babylon with his father, who led the Babylonian Army away from Babylon to defend the country. Nabonidus’ departure left Belshazzar as the reigning King in Babylon. He was killed on October 12, 539 A.D., when the Persians invaded Babylon. This matches the biblical account.  

Yes, Belshazzar was real, and the Old Testament contains real history.