Principle of legality in criminal law

The principle of legality in criminal law was developed in the eighteenth century by the Italian criminal lawyer Cesare Beccaria and holds that no one can be convicted of a crime without a previously published legal text which clearly describes the crime (Latin: nulla poena sine lege, lit. 'no punishment without law'). This principle is accepted and codified in modern democratic states as a basic requirement of the rule of law. It has been described as "one of the most 'widely held value-judgement[s] in the entire history of human thought ' ".