Facebook's Mark Zuckerberg and Emperor Constantine.  FYI to a certain grandma: Zuckerberg studied classics in high school.

 
 
Both men are trying to save their respective cities from wild animals.  I wonder if Alan Parris is named after Paris of Troy?
 
 
 
 
 
 
From Totallylookslike.com:
 
 
Both equestrian imperialists fighting under the colors of red and yellow, just sayin'.
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Both sang and strummed:
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Both had chops