Library Diodorus Siculus Library of History, Book II
Chapter 28
Chapter 28: Arbaces as king
[8] So the empire of the Assyrians, which had endured from the time of Ninus through thirty generations, for more than one thousand three hundred years, was destroyed by the Medes in the manner described above.
English translation by C. H. Oldfather, Loeb Classical Library (1933). Public domain. Digital text via Bill Thayer / LacusCurtius (University of Chicago).