Researched and devised by Oliphant Jackson[?], MRCVS, the Jackson Ratio is a method of determining whether a tortoise, or a member of another chelonia species, is maintaining its optimum bodyweight, which is necessary for a successful hibernation
... it merely designated anyone who assumed power for any period of time without a legitimate basis of authority.
The first to have the title of "Tyrant" was Pisistratus ...