Bamberg, Dom, Detail from the
Fürstenportal Last Judgment Tympanum ca. 1200
1.1.9 Gaius 1 inst. Omnes
populi, qui legibus
reguntur, partim suo proprio, partim communi omnium hominum
(All peoples who are ruled by laws and long-standing custom partly use their own laws and partly the law that is common to all men.)
Dig.1.1.10pr. Ulpianus 1 reg. Iustitia est constans et perpetua voluntas ius suum cuique tribuendi (Justice is the constant and perpetual will of giving everyone their Ius).