Answer:
The use of decasyllabic meter
Geoffrey Chaucer was an English poet during the Middle Ages, best known for his work The Canterbury Tales. He is known as the "Father of English literature" and was the first writer to be buried in Poets' Corner of Westminster Abbey.
Chaucer is also well-known for his metrical innovation. He was one of the first English poets to use the five-stress line, which is a decasyllabic cousin to the iambic pentameter that became popular during the Elizabethan period.