Saint Gall, Stiftsbibliothek 673, p. 170

Vnde sciendum est quod error alius est personae, alius fortunae, alius conditionis alius qualitatis.  Error personae est ut cum putatur Stichus, ipse est Pampbilius.  Error fortunae est cum quis diues putatur qui pauper invenitur.  Conditionis cum qui seruus est liber ipse putatur.  Qualitatis cum qui malus est bonus esse credatur. (Hence, one should know that error is of person, fortune, condition, and quality.  Error of person is when thinks that he is Stichus and he is Pamphilus.  Error of fortune is when someone is thought to be wealthy who is found to be poor.  Error of condition is when someone is a slave and is thought to be free.  Error of quality is someone who is thought to be good but is evil).

Vulgate Gratian:  Error persone est quando hic putatur  esse Virglius et ipse est Plato.

Justinian, Digest 2.14.7.2:  Ulpianus 4 ad ed. Dedi tibi Stichum, ut Pamphilum manumittas: manumisisti: evictus est Stichus. Iulianus scribit in factum actionem a praetore dandam (I gave you Stichus so that you would manumit Pamphilus; you manumitted Stichus.  Stichus is then acquired by a third pary with a better title.  Julianus writes that the praetor can give an action in factum).

Codex iuris canonici (1983) c. 1097:  1.  Error in persona invalidum reddit matrimonium.  2. Error in qualitate personae, etsi det causam contractui, matrimonium irritum non reddit, nisi haec qualitas directe et principaliter intendatur.