Short answer. No. Article 1131 states plainly that for purposes of prescription, just title must be proved and is never presumed. If you cannot produce actual proof of a just title, the court will not assume you have one simply because you have been in possession.
What the law says
For the purposes of prescription, just title must be proved; it is never presumed.
Civil Code, Article 1131 — Just Title Is Never Presumed. Read the full provision →
The burden is squarely on you to prove it
Article 1131 leaves no room for assuming your way into a just title. For the purposes of prescription, just title must be proved; it is never presumed. If you are relying on ordinary acquisitive prescription, which requires just title along with good faith and possession for the shorter statutory period, you cannot simply assert that a just title probably exists somewhere in your chain of acquisition. You have to actually produce proof of it.
Why the law refuses to presume this element
Possession alone, even long and undisturbed possession, tells a court very little about how that possession began or whether it rested on a title that was legally sufficient to transfer ownership, even if it later turns out the grantor was not the true owner. Because just title is doing real legal work — it is what shortens the prescriptive period compared to possession without it — the law insists it be affirmatively established rather than inferred from the mere fact of long possession.
What happens if you cannot produce proof
If you cannot come forward with evidence of a just title — a deed, a contract of sale, an instrument of donation, or some other document or transaction that would have validly transferred ownership had the grantor actually owned the property — your claim to ordinary acquisitive prescription on the basis of just title fails on that element. That does not necessarily end every possible path to ownership by possession; it means specifically that this route, which depends on proving just title, is not available to you without that proof.
What this means for building your case
Since Article 1131 makes clear the court will not fill this gap for you, the practical step is gathering whatever documentary or testimonial evidence actually supports the existence of a just title behind your possession, rather than assuming your years of occupying the property will be treated as sufficient on its own. The strength of a prescription claim resting on just title depends entirely on the quality of that proof, since the presumption you might be hoping for simply does not exist under this article, and no amount of long, undisturbed possession substitutes for it.