What is Ascriptitius?

Legal Definition
Civil law. Among the Romans, ascriptitii were foreigners, who had been naturalized, and who had in general the same rights as natives. Nov. 22, ch. . 17 Code 11, 47.
-- Bouviers Law Dictionary
Legal Definition
In Roman law. A foreigner who had been registered and naturalized in the colony in which he resided. Co.d. 11, 47.
-- Black's Law Dictionary