User blog comment:Tesla Man/Big, Bad, and Deadliest: Rise of the TDBU/@comment-3189283-20120301181140

How about

Julius Ceaser vs Alexander the Great

Antiochus IV Epiphanes vs Alaric I

Xerxes vs Boudica

Miltiades vs Spartacus

Cyrus the Great vs Qin Shihuangdi

Constantine the Great vs Hannibal Bacra

Attila the Hun vs Ramesses the Great

Sargon of Akkad vs Sun Tzu