Middle Welsh is a historical form of the Welsh language that was spoken and written from the 12th to the 15th centuries. It evolved from Old Welsh and is characterized by significant changes in grammar, vocabulary, and pronunciation. Middle Welsh is notable for its rich literary tradition, including poetry and prose, which reflects the culture and history of Wales during this period. The language is primarily known through texts such as the Mabinogion, a collection of medieval tales, and various religious and legal documents. Middle Welsh serves as an important link between Old Welsh and Modern Welsh, helping linguists understand the development of the Welsh language over time.