Certain persons, especially soldiers, were privileged from observing the ordinary forms. The liability of the heir to the debts of the testator varied during different periods. At first it was practically unlimited. The law was then gradually modified in favour of the heir, until in the time of Justinian the heir who duly made an inventory of the property of the deceased was liable only for the assets to which he had succeeded. This limitation of liability is generally termed by the civilians "beneficium inventarii".