Which Post-Impressionist painter was the first great master in the new art form of the poster?

Question

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Henri de Toulouse-Lautrec was renowned for his posters, which elevated the status of the poster to fine art during the late 19th century. His innovative approach to lithography and his bold, colorful style captured the vibrant nightlife of Paris, making him a pivotal figure in the development of the modern poster.

Which Post-Impressionist Painter Was the First Great Master in the New