Guillaume de Machaut was a prominent French composer and poet of the 14th century, known for his significant contributions to medieval music and literature. He is often regarded as one of the first composers to create a complete musical setting for the Mass, a central part of Christian worship. His works include both sacred and secular music, showcasing a variety of styles and forms. In addition to his musical achievements, Machaut was also a skilled poet, writing in the Old French language. His poetry often explored themes of love and nature, reflecting the cultural and artistic trends of the Middle Ages. Machaut's influence on music and poetry has endured, making him a key figure in the history of Western art.