Actori incumbit onus probandi – this legal phrase comes from Latin. Literally it means that the claimant bears the burden of proof. In the legal practice, it applies in the sphere of Litigation procedures, where details the legal maxim that the actual burden of proofs lays on the claimant, who has to prove the aspects of their claim. In simple words, in the civil proceedings, the court leads the investigation, but it has to be done by the claimant, who is obliged to present to the court all proofs and evidences he/she is able to. It is not enough only to submit a claim, for winning a case, but also to support it with strong enough evidences which to convince the court jury in your statement.

*This is why usually plaintiffs hire lawyers to prepare and submit their civil claims.