2 But in the present day no one under our sway is permitted to indulge in excessive harshness towards his slaves, without some reason recognised by law; for, by a constitution of the Emperor Antoninus Pius, a man is made as liable to punishment for killing his own slave as for killing the slave of another person; and extreme severity on the part of masters is checked by another constitution whereby the same Emperor, in answer to inquiries from presidents of provinces concerning slaves who take refuge at churches or statues of the Emperor, commanded that on proof of intolerable cruelty a master should be compelled to sell his slaves on fair terms, so as to receive their value. And both of these are reasonable enactments, for the public interest requires that no one should make an evil use of his own property. The terms of the rescript of Antoninus to Aelius Marcianus are as follow:--'The powers of masters over their slaves ought to continue undiminished, nor ought any man to be deprived of his lawful rights; but it is the master's own interest that relief justly sought against cruelty, insufficient sustenance, or intolerable wrong, should not be denied. I enjoin you then to look into the complaints of the slaves of Iulius Sabinus, who have fled for protection to the statue of the Emperor, and if you find them treated with undue harshness or other ignominious wrong, order them to be sold, so that they may not again fall under the power of their master; and the latter will find that if he attempts to evade this my enactment, I shall visit his offence with severe punishment.' TITLE IX. OF PATERNAL POWER Our children whom we have begotten in lawful wedlock are in our power. 1 Wedlock or matrimony is the union of male and female, involving the habitual intercourse of daily life. 2 The power which we have over our children is peculiar to Roman citizens, and is found in no other nation. 3 The offspring then of you and your wife is in your power, and so too is that of your son and his wife, that is to say, your grandson and granddaughter, and so on. But the offspring of your daughter is not in your power, but in that of its own father. TITLE X. OF MARRIAGE Roman citizens are joined together in lawful wedlock when they are united according to law, the man having reached years of puberty, and the woman being of a marriageable age, whether they be independent or dependent: provided that, in the latter case, they must have the consent of the parents in whose power they respectively are, the necessity of which, and even of its being given before the marriage takes place, is recognised no less by natural reason than by law. Hence the question has arisen, can the daughter or son of a lunatic lawfully contract marriage? and as the doubt still remained with regard to the son, we decided that, like the daughter, the son of a lunatic might marry even without the intervention of his father, according to the mode prescribed by our constitution.