Who was known as the king of ragtime?

Scott Joplin is known as the "King of Ragtime." He was a prominent African American composer and pianist who popularized the ragtime genre in the late 19th and early 20th centuries. His most famous works include "Maple Leaf Rag" and "The Entertainer," which have become iconic pieces of American music. Joplin's contributions helped lay the foundation for later styles of jazz and popular music.