overlord

[oh-ver-lawrd]
noun
1.
a person who is lord over another or over other lords: to obey the will of one's sovereign and overlord.
2.
a person of great influence, authority, power, or the like: the overlords of industry.
verb (used with object)
3.
to rule or govern arbitrarily or tyrannically; domineer.

Origin:
1150–1200; Middle English; see over-, lord

overlordship, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
overlord (ˈəʊvəˌlɔːd)
 
n
a supreme lord or master
 
'overlordship
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

overlord
c.1200, from over + lord.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Conceived by an ambitious local overlord, the plan went awry.
Apple is now the overlord of music players, tablet computers and app phones.
There's no evil overlord making that definition and imposing that on the world.
Of course, full human employment may not be a part of a sentient robot
  overlord's grand plan.
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