Institutionum libri
Ex libro XII
Marcianus, Institutes, Book XII. The freedwoman of another can be kept in concubinage as well as a woman who is born free, and this is especially the case where she is of a low origin, or has lived by prostitution; otherwise if a man prefers to keep a woman of respectable character and who is free born in concubinage, it is evident that he can not be permitted to do so without openly stating the fact in the presence of witnesses; but it will be necessary for him either to marry her, or if he refuses, to subject her to disgrace. 1Adultery is not committed by a party who lives with a concubine because concubinage obtains its name from the law, and does not involve a legal penalty; as Marcellus states in the Seventh Book of the Digest.
Marcianus, Institutes, Book XII. It should be noted that a debtor to the government cannot perform the duties devolving on an embassy. This the Divine Pius stated in a Rescript addressed to Claudius Saturninus and Faustinus. 1Persons who have not the right to prosecute cannot exercise the function of an envoy; and the Divine Severus and Antoninus stated in a Rescript that anyone who had been appointed to contend in the arena could not legally be one. 2Debtors of the Treasury, however, are not forbidden to perform the duties of an envoy. 3Where a charge has been publicly brought against anyone the accuser should not be compelled to undertake the duties of an envoy to one who alleges that he is a friend, or belongs to the family of the accused party. This was stated by the Divine Brothers in a Rescript to Æmilius Rufus. 4Envoys cannot appoint others their substitutes, with the exception of their sons. 5Everyone is compelled to perform the functions of an envoy in his turn, but is not obliged to do so until those who have been chosen before him in an assembly have performed theirs. If, however, the embassy requires men of the first rank, and those who are called in their order are of inferior degree, the regular order should not be observed, as the Divine Hadrian stated in a Rescript addressed to the Clazomenians. 6It is provided by an Edict of the Divine Vespasian addressed to all cities that one municipality shall not send more than three envoys.