In 1783 became the Baron of Rawdon, located in Hastings County, Ontario and in 1817 also the Marquess of Hastings County, fifteen years after the county and three of its early townships were named after him.[3]
Becoming a Whig in politics, he entered government as part of the Ministry of all The Talents in 1806 as Master-General of the Ordnance, but resigned upon the fall of the ministry the next year. Being a close associate of the Prince-Regent, Moira was asked by him to try to form a Whig government after the assassination of Spencer Perceval in 1812 ended that ministry. Both of Moira's attempts to create a governing coalition failed, and the Tories returned to power under the Earl of Liverpool.
Through the influence of the Prince-Regent, Moira was appointed Governor-General of India in 1813. His tenure as Governor-General was a memorable one, overseeing the victory in the Gurkha War (1814–1816); the final conquest of the Marathas in 1818; and the purchase of the island of Singapore in 1819. His domestic policy in India was also largely successful, seeing the repair of the Mogul canal system in Delhi as well as educational and administrative reforms. He was raised to the rank of Marquess of Hastings in 1817.
Hastings' tenure in India ended due to a financial scandal in 1823, and he returned to England, being appointed Governor-General of Malta in 1824. He died at sea off Naples two years later.