It is FALSE. The Roman empire was in decline long before the 5th century AD. The golden age actually ended with the reign of the emperor Marcus Aurelius in the 2nd century AD. He was the last of the "good" emperors. After his death, Rome went into decline, and never recovered. With a few exceptions, the successors to Marcus Aurelius were weak emperors. Furthermore, invaders had been attacking the Roman empire for a very long time before the 5th century. For example, the Visigoths invaded Italy during the 4th century, and did a lot damage and sacking.