Why Chaucer is called the Father of English poetry?

is called the
father of English literature because he was the first to write what became generally well-known
and recognized poems and stories in the language of the common people of his time - medieval
English. Until that time, the language of the educated and of written literature in England was
Latin or French. Chaucer wrote a great many works that were well-received during his lifetime
and that continue to be recognized as masterpieces, but the defining factor that sets him apart
was the fact that they were written in English.