People from Prussia, a historical kingdom and state in northern Europe (mostly in what is now Germany and Poland).
From 'Prussia,' a region named after the Prussian people. The suffix '-s' makes it plural. Prussia was an important European power from the 1600s to 1900s.
Prussians were famous for their rigid military discipline and strict rules—they influenced modern military training so much that their reputation for 'Prussian discipline' is still used today to describe strict, no-nonsense organization!
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