Dionysius Exiguus[ig zig′yo̵̅o̅ əs, -sig′-]
Dionysius Exiguus definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
6th cent. ; Rom. monk & Christian theologian, born in Scythia: believed to have introduced the current system of numbering years on the basis of the Christian Era
Dionysius Exiguus definition by American Heritage Dictionary
Scythian monk and scholar who introduced the method of reckoning the Christian era from the birth of Christ.