Iavolenus Priscus

Lucius Iavolenus Priscus (c. 60 Nedinium – c. 120 AD) was an eminent Roman jurist, who had an illustrious public and military career in the Imperial service during the reigns of Nerva, Trajan, and Hadrian in various provinces around the empire. He was the teacher of another well known Roman jurist Salvius Julianus.

He is best known for his saying that "every definition in civil law is dangerous, for rare are those that cannot be subverted." (Omnis definitio in iure civili periculosa est; parum est enim, ut non subverti posset.)