He started a trend that flourished later in Shakespeare's writing. He had a multi-faceted personality and he knew the world not from the point of merely writing but from other angles. He was a diplomate. He was sent on various diplomatic missions to Italy and France on different occasions.
Initially, he wrote in French and also in Latin. He was also a soldier, and he took part in certain battles. Thirdly, he was a scholar. In the Feudal Lords & Serfs, the world was divided, and Chaucer belonged to neither of them classes. He was somewhere in between. He was a middle-class person, not in today's sense but in the sense of those days. He lives by his skills, by his labors or tendency. His roots were in the professional class, but he also had a keen eye for the ordinary man.
With him, Modern English Literature begins. Therefore, he is known as the father of English Literature. Today, the English form is very elegant, very developed, very precise, great vocabulary, and the language is not standardized. Chaucer is rightly called the evening star of the Medieval Age and the morning star of the Renaissance because he represents both the old and new order in his poetry.
Chaucer came from the upper layer of the hierarchy of society. Chaucer tells the story in the manner of a bard, in the manner of a person who sings. He writes lines that are measured. He writes lines that have rhythm. He is not describing; he is telling. He writes in people's language, which is a common language. He performed ambassadorial duties as well as being a man of the court.
Chaucer is addictive. You read Chaucer, and you read Chaucer again. He was an amazing writer; he knew how to write about all the strata of society.