Louis IV of France, also known as Louis the Stammerer, was a king who ruled from 877 to 879. He was the son of Charles the Bald and became king after the death of his father. His reign was marked by challenges, including conflicts with nobles and Viking invasions, which weakened his authority. Louis IV's reign was short-lived, lasting only two years before his death in 879. Despite his struggles, he is remembered as a part of the Carolingian dynasty, which played a significant role in shaping medieval France. His legacy continued through his descendants, influencing future French monarchs.