Pandectarum libri
Ex libro III
Modestinus, Pandects, Book III. There is this difference between agnates and cognates: cognates are included among agnates, but agnates are not included among cognates; for example, the brother of a father, that is, the paternal uncle, is both an agnate and a cognate, but the brother of a mother, that is to say, the maternal uncle, is an agnate, but not a cognate. 1As long as there is any hope that a deceased person will have a direct heir, there is no ground for the claim of blood relatives to the estate; for example, where the wife of the deceased is pregnant, or his son is in the hands of the enemy.
The Same, Pandects, Book V. A person charged with the manumission of a slave under the terms of a trust can, in no way whatever, render the condition of the said slave worse; and therefore he cannot in the meantime sell him to anyone else, in order that he to whom he was sold may emancipate him; and if he should deliver the slave, he will be compelled to purchase and manumit him; for it is sometimes to the interest of a slave to be manumitted by an old man rather than by a young one.