[IDEM libro secundo definitionum. ] §44.3.11.prCum heres in ius omne defuncti succedit, ignoratione sua defuncti uitia non excludit, ueluti cum sciens alienum illum illo uel precario possedit: quamuis enim precarium heredem ignorantem non teneat nec interdicto recte conueniatur, tamen usucapere non poterit, quod defunctus non potuit.
[THE SAME, Definitions, book two] Since an heir succeeds to all the rights of the deceased, he does not by his own ignorance exclude the defects of the deceased; as, for example, when the deceased possessed a thing knowing it to belong to another, or possessed it by precarium from him. For although the precarium does not bind an ignorant heir, nor can he be properly sued by interdict, nevertheless he will not be able to acquire by usucapion what the deceased could not.
idem iuris est, cum de longa possessione quaeritur: neque enim recte defendetur, cum exordium ei bonae fidei ratio non tueatur.
The same rule of law applies when a question is raised concerning long possession; for it will not be properly defended, since the principle of good faith does not protect its beginning for him.