ingenui

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
INGENUI, civ. law. Those freemen who were born free. Vicat, vocab. 
     2. They were a class of freemen, distinguished from those who, born 
slaves, had afterwards legally obtained their freedom the latter were called 
at various periods, sometimes liberti, sometimes libertini. An unjust or 
illegal servitude did not prevent a man from being ingenuus. 
    

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