Justinian I through the reign of Constantine IV, and appearing as late as the reign of Leo VI in the tenth century. After the name fell into disuse among the Byzantine emperors, it was used as a title of legitimacy among the barbarian rulers of former Roman provinces, such as Spain, where the Visigoths and their Spanish successors used the title "Emperor of All Spain", and the kings of the Ostrogothic Kingdom of Italy and the Kingdom of the Lombards.</ref> In modern use, Flavius is a personal name, and widely used in romance languages, including Italian and Spanish Flavio (fem. Flavia), French Flavien (fem. Flavie), Portuguese Flávio (fem. Flávia), and Romanian Flavius or Flaviu (fem. Flavia). Praenomina The early Flavii used the praenomina Marcus, Quintus, Gaius, and Lucius. Of these, only Gaius and Lucius are known from the family of the Fimbriae. The name Gnaeus occurs once, but as the son of a freedman of the family, and thus does not seem to be representative of the gens. The Flavii Sabini appear to have restricted themselves to the praenomen Titus alone, and distinguished their sons by the use of different surnames, usually by giving the younger sons surnames derived from their maternal ancestors. Branches and cognomina The Flavii of the Republic used the cognomina Fimbria, Gallus, Lucanus, and Pusio. Only the Fimbriae, whose surname refers to a fringe or border, represented a distinct family. Gallus and Lucanus belong to a class of surnames derived from places of origin or association, referring to Gaul and Lucania, respectively, although Gallus, a very common surname, could also refer to a cockerel. Pusio was originally a nickname indicating a little boy, and would have been bestowed on someone small or youthful. The Flavii Sabini, whose surname indicates Sabine ancestry, rose to prominence under the Empire. They were descended from Titus Flavius Petro, a soldier from Reate who fought under Gnaeus Pompeius Magnus. Within two generations they had attained such respectability that two of his grandsons held the consulship in consecutive years, AD 51 and 52; the younger of these marched to Rome at the head of an army in the year of the four emperors, AD 69, and claimed the imperial dignity as the emperor Vespasian. However, within less than thirty years, the family was largely destroyed through the workings of Vespasian's son, the emperor Domitian. The Flavii Titiani may be descended from the