The Allahabad Pillar inscription, a "prashasti" (eulogy) was written by his courtier Harishena. It told of his many military conquests. It suggests that he defeated several kings of northern India. Also, that he added their territories to his empire. He also marched along the south-eastern coast of India. He advanced to move as far as the Pallava kingdom. In addition, he subjugated several frontier kingdoms and tribal oligarchies.