Darius III Died 330 bc. King of Persia (336-330) who was defeated in several battles by Alexander the Great. His murder by a Bactrian satrap effectively ended the Persian Empire.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Darius III n (Biography) died 330 bc, last Achaemenid king of Persia (336?330), who was defeated by Alexander the Great Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Darius III n. (Codomannus), died 330 B.C., king of Persia 336?330. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.