王羲之 (Wang Xizhi) was a renowned Chinese calligrapher who lived during the Eastern Jin dynasty (303-361 AD). He is often referred to as the "Sage of Calligraphy" and is celebrated for his mastery of the running script (行书), which blends fluidity and elegance. His most famous work, the "Lantingji Xu" (兰亭集序), is a preface to a poetry gathering and is considered a masterpiece of Chinese literature and calligraphy. Wang Xizhi's influence on calligraphy has been profound, inspiring generations of artists and scholars. His techniques and styles are still studied and emulated today, making him a pivotal figure in the history of Chinese art. His contributions have solidified his legacy as one of the greatest calligraphers in Chinese history.