I recommend you look at the definition of “Tyrannus”.
Why? I do see that I misspelled it. It should be “tyrannis”, i.e. the Dative Case “to tyrants.” And it is the official motto of the Commonwealth of Virginia, for what that is worth. If you are referring to the ancient origination as “unelected ruler” (like Obama), it also has the connotation of “despot” who acts only in accordance with his own will.