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'chosen man of the centuria'; second-in-command and rear rank officer of a centuria; classed as a duplicarius, a soldier receiving double basic pay; he carried a hastile (wooden staff).
* Optio centurionis: 'chosen man of the centurion'; same as optio centuriae.
* Optio custodiarum: soldier in charge of guard posts.
* Optio draconarius: 'chosen man among the dragon bearers', a late Roman senior standard bearer.
* Optio equitum:

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