The Roman family is purely patriarchal; if there ever was a time when the more primitive matrilinear system prevailed among any part of the population it has left no traces in the legal system, and Roman law is indeed characterised by the exceptionally great power which it allows to the father as head of the family. Originally, no doubt, this power was a general, rather vaguely conceived, supremacy, but by the time of the XII Tables it has crystallised and become differentiated, so that its name varies according to the persons over whom it is exercised. Over the wife and the sons' wives it is manus, over the children and slaves potestas, patria potestas in the former, dominica potestas in the latter case, while the bondsmen are said to be in mancipio.
- Marriage
The normal marriage at this period is accompanied by manus, i.e. the woman passes out of her father's family and comes under the despotic rule of her husband. It appears, however, that already by the time of the XII Tables this was not necessarily the case. Apart from the question of manus, marriage was to the Romans, as to the other peoples of antiquity, a de facto rather than a de jure matter, in the sense that two people were held to be married, not because they had gone though any particular ceremony, but because they in fact lived together as man and wife. This state of affairs begins ordinarily with the bringing of the bride to the house of the bridegroom (domum deductio), but no special legal significance attaches to this proceeding, except in so far as it is in fact the beginning of conjugal life. As we shall see, however, manus would in early times normally result in such conjugal life were continued for a period, and thus it may properly be said that marriage with manus was the rule at the time of the XII Tables. Manus may arise in any one of three ways, by confarreatio, coemtio, or usus.








