Justinian I

from The American Heritage® Dictionary of the English Language, 5th Edition.

• Byzantine emperor (527–565) who held the eastern frontier of his empire against the Persians and reconquered former Roman territories in Africa, Italy, and Spain. He ruled jointly with his wife, Theodora.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun Byzantine emperor who held the eastern frontier of his empire against the Persians; codified Roman law in 529; his general Belisarius regained North Africa and Spain (483-565)