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Val·en·tin·ian I(văl′ən-tĭn′ē-ən, -tĭn′yən) ad 321-375.
Emperor of Rome in the West (364-375) who ruled jointly with his brother Valens in the East. He led numerous military campaigns in Africa and Europe.
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.
Valentinian I(ˌvælənˈtɪnɪən) or
(Biography) 321–375 ad, emperor of the Western Roman Empire (364–375); appointed his brother Valens to rule the Eastern Empire
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014