[NERATIUS libro quinto membranarum. ] §41.10.5.prUsucapio rerum, etiam ex aliis causis concessa interim, propter ea, quae nostra existimantes possideremus, constituta est, ut aliquis litium finis esset.
[NERATIUS, from his fifth book of Parchments.] The usucapion of things, although meanwhile granted also for other reasons, was established on account of those things which we possess thinking they are ours, so that there might be some end to litigation.
sed id, quod quis, cum suum esse existimaret, possederit, usucapiet, etiamsi falsa fuerit eius existimatio.
But what anyone has possessed when he estimated that it was his own, he will acquire by usucapion, even if his estimation was false.
quod tamen ita interpretandum est, ut probabilis error possidentis usucapioni non obstet, ueluti si ob id aliquid possideam, quod seruum meum aut eius, cuius in locum hereditario iure successi, emisse id falso existimem, quia in alieni facti ignorantia tolerabilis error est.
This, however, must be so interpreted that a plausible error of the possessor does not stand in the way of usucapion, as for instance, if I possess something for the reason that I falsely estimate that my slave, or he to whose place I have succeeded by hereditary right, bought it; for error in ignorance of another's act is excusable.