[MARCIANUS libro singulari ad formulam hypothecariam. ] §22.3.23.prAnte omnia probandum est, quod inter agentem et debitorem conuenit, ut pignori hypothecaeue sit: sed et si hoc probet actor, illud quoque implere debet rem pertinere ad debitorem eo tempore quo conuenit de pignore, aut cuius uoluntate hypotheca data sit.
[MARCIANUS, in the single book on the Hypothecary Formula.] Before all things, it must be proved that an agreement was made between the plaintiff and the debtor that [the property] should be a pledge or a hypothec; but even if the plaintiff proves this, he must also satisfy this requirement: that the property belonged to the debtor at the time when the agreement concerning the pledge was made, or [to the person] by whose consent the hypothec was given.