The GNU Free Documentation License states (Note: the following has been wikified and is unofficial):
This License applies to any manual or other work that contains a notice placed by the copyright holder saying it can be distributed under the terms of this License. The Document, below, refers to any such manual or work.
... a legitimate basis of authority.
The first to have the title of "Tyrant" was Pisistratus in 560 BC.
In modern times Tyrant has come to mean a dictator who rules ...