What was the name of the major Christian empire that controlled Europe during the Middle Ages?

The major Christian empire that controlled much of Europe during the Middle Ages was the Holy Roman Empire. Established in the early medieval period, it aimed to unify Christian territories under a single ruler, often an emperor crowned by the Pope. The empire played a significant role in the political and religious landscape of Europe, influencing governance, culture, and the spread of Christianity until its dissolution in the early 19th century.