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The Fall of the Roman Empire: A New History of Rome and the Barbarians by Peter Heather. Shows how Europe's barbarians, transformed by centuries of contact with Rome on every possible level, eventually pulled the Roman empire apart.
The Restoration of Rome: Barbarian Popes and Imperial Pretenders by Peter Heather. After the fall of the Roman Empire, each of the three greatest contenders for imperial power -- Theoderic, Justinian, and Charlemagne -- operated with a different power base but was successful in his own way.
Rome and the Barbarians: 100 B.C. - A.D. 400 by Thomas S. Burns. Shows how Rome's relations with the barbarians slowly evolved from ignorance, hostility, and suspicion toward tolerance, synergy, and integration.
Roman Barbarians: The Royal Court and Culture in the Early Medieval West by Yitzhak Hen. A study of the formative period when Roman and Christian practices mingled with Germanic practices to produce medieval civilization.
The Fall of Rome: And the End of Civilization by Bryan Ward-Perkins. Argues that the fall of Rome was not a peaceful blending of barbarians into Roman culture, but a time of horror and dislocation that destroyed a great civilization.
Barbarian Kings and European Identity edited by M. C. La Rocca. Historiography, archaeology and memory.
Gaiseric: The Vandal Who Destroyed Rome by Ian Hughes. The Vandal king Gaiseric's son, Huneric, was betrothed to Eudoxia, daughter of Roman emperor Valentinian III. Her appeal for help after her father's murder led Gaiseric to invade and sack Rome.
A History of the Vandals by Torsten Cumberland Jacobsen. The first general history in English of the Germanic people who sacked Rome in the 5th century AD and established a kingdom in North Africa.