He was raised to the title of Marquess Cornwallis in 1792 as recognition for his performance in the Third Anglo-Mysore War, in which he extracted significant concessions from the Mysorean ruler, Tipu Sultan. He returned to England in 1793, and was subsequently engaged in a variety of administrative and diplomatic postings until 1798, when he was posted to the Kingdom of Ireland as Lord Lieutenant and Commander-in-Chief, similar to his leadership posts in India. After returning from Ireland in 1801, he was again posted to India. He arrived in July 1805, and died the same October in Ghazipur. Cornwallis was buried at Ghazipur, and is memorialized throughout India.