Plural of castulus; small Roman military forts or fortified positions, or small portable receptacles used by Roman soldiers.
From Latin 'castulus' (a small camp or fortress), a diminutive form of 'castrum' (camp), with the Latin plural suffix '-i'.
Archaeological evidence shows that castuli, though small, were strategically placed along Roman roads to enable rapid communication—messages could travel from castulum to castulum, creating an ancient postal system.
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