Vandals, ancient Germanic people. They gradually migrated from south of the Baltic to Pannonia and Dacia. In the 5th century they invaded the Roman Empire, ravaging Gaul and Spain. Under Genseric they established a strong Vandal kingdom in northern Africa (429) that extended to Sicily, and in 455 they sacked Rome. The Vandals were finally defeated by the Byzantine Belisarius, after which they disappeared as a unified people.