Why is Chaucer called "the father of English poetry"?

Chaucer was a representative writer in the early English Renaissance. He was the first to write in London dialect, which laid the foundation of modern English literary language. He inherited the tradition of describing reality in urban literature and initiated the realistic road of English literature. His works are characterized by humor and satire, and are far superior to other English literary works in characterization, language use and narrative skills. Chaucer won the reputation of "the father of English poetry" for his highly realistic achievements.