The Memoirs of Jahāngīr (Jahāngīrnāma) 2.6

2.6

When Sikandar Lodi designed to take Gwalior he came to Agra from Delhi, which was the capital of the Sultans of India, and settled down there. From that date the population and prosperity of Agra increased, and it became the capital of the Sultans of Delhi. When God Almighty bestowed the rule of India on this illustrious family, the late king, Babar, after the defeat of Ibrahim, the son of Sikandar Lodi, and his being killed, and after his victory over Rana Sanga, who was the chief of the Rajas of Hindustan, established on the east side of the Jumna, on improved land, a garden (charbagh) which few places equal in beauty. He gave it the name of Gul-afshan