oculatus testis (who saw that to which he bears testimony; opposed to auritus testis, an ear-witness, Plaut., Truc., 2, 6, 8); certus or certissimus testis (general term, a sure, credible witness); certus auctor (a credible voucher): to know from eye-witnesses, certis testibus or certis auctoribus comperisse: I am an eye-witness of anything, aliquid ipse vidi (I saw something myself); alicui rei interfui (I was present at something): without eye-witnesses, remotis arbitris; sine arbitris.