The Holy Roman Empire helped strengthen Europe in several ways: 1. Charlemagne united many Frankish tribes and expanded their territory across modern-day France, Germany, Belgium, and Italy. He standardized laws and administration across this territory. 2. Charlemagne was crowned by the Pope as the first Holy Roman Emperor, reviving the tradition of the Roman Empire. This brought political stability and promoted the spread of Christianity. 3. Though the empire fragmented after Charlemagne's death, it laid the foundations for the development of powerful kingdoms like France and Germany in the medieval period.