在自然法的概念史上乌尔比安与阿奎那的定义同等著名。《学说汇纂》和《法学总论》记载着乌尔比安关于自然法、万民法和市民法的三分法以及对自然法的较为完整的定义。乌尔比安的观点一直困扰着中世纪的法学家及自然法理论思考,并成为阿奎那著作中“权威引证”的来源。阿奎那试图把乌尔比安的定义整合进“自然倾向”的结构之中,从而作为自然法及其律令的认识内容。阿奎那对乌尔比安的这种接纳是外在因素与内在因素相互作用的结果。 Urbian was as famous as Aquinas in the history of the concept of natural law. The Collection of Doctrines and the General Law of Jurisprudence document Urbian’s three-point law on natural law, the law of peoples and civil law and a more complete definition of natural law. Urbihin’s view has plagued medieval meditators and natural law theories and becomes a source of “authoritative references” in Aquinas’s writings. Aquinas attempted to integrate Urbian’s definition into the structure of “natural tendencies,” thereby becoming the content of knowledge of natural law and its ordinances. Aquinas’s acceptance of Urbian is the result of the interaction of external and internal factors.