the.com/ruler

a flat little tyrant that decides what's straight and who gets knuckles.

means A straight strip of wood, metal, or plastic marked with units, used for measuring lengths and drawing straight lines — or, the person who governs a place.

from From Old French 'reuler' and Latin 'regula,' a straight stick or bar, hence a rule or pattern, all rooted in 'regere,' to keep straight, guide, govern — a cousin of 'regal' and 'regiment.' The same Latin thread ties together the thing that measures lines and the person who lays down the law: both, in the old sense, keep things straight.

royal sense
Same word names monarchs and measuring sticks alike.
standard origin
A meter was once a platinum bar in Paris.
classroom weapon
Wielded for decades as schoolhouse instrument of discipline.
hidden math
Many include conversion tables and protractor curves.
flexible kin
Tape measures are just rulers that gave up rigidity.
for instance

henry viii — english king who ruled 1509-1547 and established the church of england

napoleon bonaparte — french military leader who ruled france 1804-1814 as emperor

victoria queen — british monarch who ruled 1837-1901 during the victorian era

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