Homer

He may have been one of the forerunners of writing down poetic song previously transmitted orally.

An excerpt from the article 17 facts about Homer

In the eighth century BC, alphabetic writing was introduced to Greece. There was a growing shift away from recitation towards poetry recorded in writing. It is thought that Homer and his circle of disciples and helpers may have been among the pioneers in writing down the poetic songs that had been passed down orally. Writing made large literary forms possible. The Iliad has over 15,000 and the Odyssey over 12,000 verses.