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The Digest of Justinian

§1.7.23.pr

Scope of Agnation through Adoption and Marriage Prohibitions

Paulus explains that since adoption creates the right of agnation rather than blood, no relation is established with the adoptive father's wife or mother, whereas a legal sibling relationship is established with the daughter in the same family, preventing their marriage.

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[PAULUS libro trigensimo quinto ad edictum.]

[PAUL, on the Edict, book 35.]

§1.7.23.pr

​Qui in adoptionem datur, his quibus adgnascitur et cognatus fit,1 quibus uero non adgnascitur nec cognatus fit: adoptio enim non ius sanguinis, sed ius adgnationis adfert. et ideo si filium adoptauero, uxor mea illi matris loco non est, neque enim adgnascitur ei, propter quod nec cognata eius fit: item nec mater mea auiae loco illi est, quoniam his, qui extra familiam meam sunt, non adgnascitur: sed filiae meae is quem adoptaui frater fit, quoniam in familia mea est filia: nuptiis tamen etiam eorum prohibitis.2

​He who is given in adoption becomes a cognate to those to whom he becomes an agnate, but to those to whom he does not become an agnate, he does not become a cognate either; for adoption does not bring the right of blood, but the right of agnation. And therefore, if I adopt a son, my wife is not in the position of a mother to him, for she does not become an agnate to him, and because of this she does not become his cognate either. Likewise, my mother is not in the position of a grandmother to him, since he does not become an agnate to those who are outside my family. But he whom I have adopted becomes a brother to my daughter, since my daughter is in my family; their marriage, however, being also forbidden.

Syntax notes2 items
  1. 1.7.23.prhis quibus adgnascitur et cognatus fit

    The demonstrative pronoun his (dative) serves as the antecedent of the relative pronoun quibus and syntactically depends on both the verb adgnascitur (which governs the dative) and the adjective cognatus (which takes the dative). In the second half (quibus uero...), a corresponding [eis] is understood as omitted.

  2. 1.7.23.prnuptiis tamen etiam eorum prohibitis

    An ablative absolute construction (noun nuptiis + perfect participle prohibitis) accompanied by the conjunction tamen (however), expressing a restriction that, because they become legal siblings, their marriage is forbidden.

Translated by Gemini 3.5 Flash (published 2026-07-12)urn:cts:latinLit:phi2806.phi002.humanitext-lat1:1.7.23.pr