Excerpts from Books and Wikipedia
See Halley's Bible Handbook, p. 395-6. "Cyrus next mobilized against the Babylonian Empire, ruled by a king named Nabonidus (ca 556-539 B.C.E.), a monarch more interested in antiquities than politics. A few years into his reign he allowed his son, Bel-shar-usur, to rule with him as co-regent (ca 553-540 B.C.E.). This person is arguable the "Belshazzar" of the Book of Daniel, which describes the visions of a Hebrew exile at the court in Babylon." [Isbouts: Biblical World, p. 235] "24:14 And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come. 24:15 When ye therefore shall see the abomination of desolation, spoken of by Daniel the prophet, stand in the holy place, (whoso readeth, let him understand,)" [King James Bible, Matthew]