Guilhem IX, also known as William IX of Aquitaine, was a prominent nobleman and poet from the 12th century. Born around 1071, he was the Duke of Aquitaine and a key figure in the Occitan culture. Guilhem is often recognized as one of the first known troubadours, contributing significantly to the development of medieval poetry and courtly love themes. His life was marked by political intrigue and military campaigns, as he sought to expand his territories. Guilhem IX was also known for his patronage of the arts, influencing the literary landscape of his time. He passed away in 1127, leaving a lasting legacy in French literature.