The principal formalities and rules according to the jus quiritium, jus civile, and the edicta prætorum.
This was named the jus gentium, to distinguish it from the other, the jus civile.
Usucapio in the jus civile hinges on possession, and ownership by the jus naturale may take its origin in possession.
The Roman law proper, the jus civile, had multifarious sources.
While he sets forth the jus civile, his exposition and approval follow the dictates of the jus naturale.