4 A person in paternal power does not become independent by entering the army or becoming a senator, for military service or consular dignity does not set a son free from the power of his father. But by our constitution the supreme dignity of the patriciate frees a son from power immediately on the receipt of the imperial patent; for who would allow anything so unreasonable as that, while a father is able by emancipation to release his son from the tie of his power, the imperial majesty should be unable to release from dependence on another the man whom it has selected as a father of the State? 5 Again, capture of the father by the enemy makes him a slave of the latter; but the status of his children is suspended by his right of subsequent restoration by postliminium; for on escape from captivity a man recovers all his former rights, and among them the right of paternal power over his children, the law of postliminium resting on a fiction that the captive has never been absent from the state. But if he dies in captivity the son is reckoned to have been independent from the moment of his father's capture. So too, if a son or a grandson is captured by the enemy, the power of his ascendant is provisionally suspended, though he may again be subjected to it by postliminium. This term is derived from 'limen' and 'post,' which explains why we say that the person who has been captured by the enemy and has come back into our territories has returned by postliminium: for just as the threshold forms the boundary of a house, so the ancients represented the boundaries of the empire as a threshold; and this is also the origin of the term 'limes, signifying a kind of end and limit. Thus postliminium means that the captive returns by the same threshold at which he was lost. A captive who is recovered after a victory over the enemy is deemed to have returned by postliminium. 6 Emancipation also liberates children from the power of the parent. Formerly it was effected either by the observance of an old form prescribed by statute by which the son was fictitiously sold and then manumitted, or by imperial rescript. Our forethought, however, has amended this by a constitution, which has abolished the old fictitious form, and enabled parents to go directly to a competent judge or magistrate, and in his presence release their sons or daughters, grandsons or granddaughters, and so on, from their power. After this, the father has by the praetor's edict the same rights over the property of the emancipated child as a patron has over the property of his freedman: and if at the time of emancipation the child, whether son or daughter, or in some remoter degree of relationship, is beneath the age of puberty, the father becomes by the emancipation his or her guardian.