Why was king Alfred so great?

King Alfred the Great is celebrated for his successful defense of England against Viking invasions, particularly during the late 9th century. He implemented military reforms, established a network of fortified towns, and promoted education and literacy, fostering a revival of learning in his kingdom. Alfred also codified laws and encouraged the use of the English language in writing, which helped lay the foundation for a unified English identity. His leadership and vision earned him a lasting legacy as one of England's greatest monarchs.