[ULPIANUS libro tertio disputationum. ] §23.2.56.prEtiam si concubinam quis habuerit sororis filiam, licet libertinam, incestum committitur.
[ULPIAN, in the third book of his Disputations.] Even if someone has had his sister's daughter as a concubine, even though she be a freedwoman, incest is committed.