if liber, the term applied to a man or to his head when the procreative spirit in him was naturally active thus, and spear… for the early Romans freedom was the affair of the procreative spirit in a man, his genius
Onians argues that Latin liber originally denoted the uninhibited activity of the male procreative spirit—the genius—thereby grounding the concept of freedom in bodily vitality rather than in juridical status.
, The origins of European thought about the body, the mind,, 1988thesis