Arulmozhi Varman was the birth name of Raja Raja Chola I, the great Chola emperor who ruled from 985-1014 CE. He is renowned for his military conquests, administrative reforms, and the construction of the Brihadeeswarar Temple at Thanjavur. The other options (Ritu Kumar - fashion designer, Sujatha - Tamil writer, Takhallus - literary pen name) are unrelated to Chola history.