The problems linked to the uncertainty of legal texts are the main issue of the article. The problem focuses on the impact on the legal system of the lack of legal texts to support decisions. The matter of analysis lays on the roman legal experience, more specifically on the facts described by Pomponius on D.1,2,2,1. This text reports the problems derived from the inexistence of legal texts along the monarchy period and its solution, through a statutes collection known as ius Papirianum.