Who did the invading in the postclassical era?

In the postclassical era, which roughly spans from 500 to 1500 CE, various groups conducted invasions across different regions. Notable invaders included the Vikings in Northern Europe, who raided and settled in parts of the British Isles and beyond; the Mongols, who created one of the largest empires in history through their conquests across Asia and into Europe; and Muslim armies that spread Islam through military campaigns in North Africa, the Iberian Peninsula, and parts of Asia. These invasions significantly influenced the political, cultural, and social landscapes of the regions affected.