Why did people call alfed the great?

Alfred the Great, King of Wessex from 871 to 899, earned his title due to his significant contributions to the defense of his kingdom against Viking invasions, particularly his successful military strategies and fortification of towns. He also promoted education, legal reform, and the promotion of the English language, which helped unify and strengthen his realm. Additionally, his establishment of a system of local governance and the revival of learning and culture during his reign further solidified his legacy as a wise and effective ruler.