Ius naturale
（重定向自Jus naturale）
Ius naturale is Latin for "natural law", the laws common to all beings. Roman jurists wondered why the ius gentium (the laws which applied to foreigners and citizens alike) was in general accepted by all people living in the Empire. Their conclusion was that these laws made sense to a reasonable person and thus were followed. All laws which would make sense to a normal person were called ius naturale.