An Anglo-Saxon kingdom of northern England formed in the seventh century by the union of Bernicia and Deira, Angle kingdoms originally established c. A.D. 500. Much of Northumbria fell to invading Danes in the ninth century and was annexed to Wessex in 954.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved.
