Sales

A sale in Roman law was a contract by which one person agreed to deliver a thing to another who, on his part, agreed to pay a certairi price therefor. The contract was complete and binding as soon as the thing to be delivered and the price to be paid were agreed upon. No particular form was required.

Writing was not necessary, but Justinian enacted that no sale effected by an agreement in writing should be good and binding unless the agreement was written out by, or at least signed by, the parties, or, if written by a notary, was duly drawn by him and executed by the parties.

So long as any of these requirements remained unsatisfied, either party might withdraw with impunity, provided no earnest (arrha) had been given. But where earnest had been given, a party refusing to perform, whether the agreement was in writing or not, if the buyer, forfeited what he had given, and if the seller, had to restore double what he had received.

A sale was a bona fidei negotium, and the parties were required to do not merely what they had expressly agreed to do, but whatever else was required by good faith. The thing sold might be either immovable property (lands, houses, etc.) or movables, and might be either corporeal or incorporeal.

A sale might be conditional, as, for example, a sale on approval (Inst. III, 3. 4).

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Effects of Marriage with Manus

By the strict marriage the wife passed into the marital power of her husband {in manum viri). The manus or marital power may be regarded as a particular form of the patria potestas. An uxor in manu was a member of her husband's household. Although called a materfamilias, this term did not have a meaning corresponding to the term paterfamilias. The wife was not the head of the family. She stood legally in the position of a daughter {in loco filiafamilias) of her husband. If she had children she was regarded as a sister of her own children. The relation of husband and wife, both as regards the wife's person and her property, was governed by the same rules of law as governed the relation of father and child. The law of husband and wife may, therefore, be considered as merely a particular branch of the law of parent and child. The husband had, in general, the same power over the person of his wife in manu as the father had over his child. Anciently, it may be suppo...
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Slavery by Birth

The children of a female slave became the slaves of her master. The status of the father as free or slave was immaterial. The general rule governing the determination of the status of a child, whether as free or slave, or as citizen or alien, was as follows : Children born in lawful wedlock had the status of the father at the moment of conception, children born out of wedlock had the status of the mother at the moment of birth. Hence if the father of a child of a lawful marriage was free at the moment of conception, the child was free although the father should subsequently lose his freedom. As to children born out of wedlock, the general rule, as above stated, was that it was the status of the mother at the moment of birth that determined the status of the child. If the mother was free at the moment of conception but a slave at the moment of birth, the child was a slave, and conversely. This was the earlier law, but the rule was modified in the interest of liber...
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Mandate (Mandatum)

Mandate (mandatum) was a contract by which one person mandatarius agreed to do something gratuitously at the request of another mandator , who, on his part, agreed to save him harmless from all loss in so doing. The mandator was said to give the mandatory a mandate, or commission to do the act in question. The term mandatum is sometimes translated "agency", but this translation is misleading. The mandatory is not properly described as an agent. Mandate was the only gratuitous consensual contract; the others, sale, hiring, and partnership, all being founded upon a consideration. Like the others, it was a bona fidei negotium , and bound the parties to do all that was required by good faith. It was of the essence of the contract of mandate that the mandatory should act gratuitously. But while this was true in a strict legal sense, it was allowed to agree upon a sum to be paid as a honorium , or salary, which might be recovered only by a special action and not b...
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