Tiberio Deciani

Tiberio Deciani or Decianus (1509–1582) was an Italian jurist working in the tradition of Renaissance humanism.

Born in Udine, Deciani studied the humaniora and then law in Padua, where he attained a doctorate in 1529.

Deciani's work was innovative in several fields that were at his time sparsely developed because they were outside the scope of the ius commune tradition.

In his Tractatus criminalis (published posthumously 1590), he was the first author to discuss general principles of criminal law, i.e. matters beyond the treatment of individual crimes and stages of procedure.

Notably, it includes the first formulation of the concepts of the objective and subjective constituent elements of a criminal act.