pater familias

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
PATER FAMILIAS, civil law. One who was sui juris and consequently was not 
either under parental power, nor under that of a master; a child in his 
cradle, therefore, could have been pater familias, if he had neither a 
master nor a father. Lec. Elem. Sec. 127, 128. 
    

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