In his own person; himself; as the defendant appeared in propria persona; the plaintiff argued the cause in propria persona. In one’s own proper person. In quo quis delinquit, in eo de jure est puniendus. In whatever thing one offends, In that is he rightfully to be punished. Co. Litt. 2336 Wing. Max. 204, max. 58. The punishment shall have relation to the nature of the offense.