The Governor of Madras who concluded the Treaty of Mangalore with Tipu Sultan was Lord Macartney.

Explanation:
The Treaty of Mangalore was signed on 11 March 1784 between the British East India Company and the Kingdom of Mysore, ruled by Tipu Sultan. This treaty brought an end to the Second Anglo-Mysore War (1780-1784) and resulted in a status quo ante bellum, which means that both sides agreed to return to the situation that existed before the war.

Governor Lord Macartney played a crucial role in negotiating and concluding the Treaty of Mangalore. Lord Macartney, also known as George Macartney, was the Governor of Madras from 1781 to 1785. He was appointed as the Governor during the Second Anglo-Mysore War and was responsible for overseeing the British military operations in the region.

Under Lord Macartney's leadership, the British forces faced several challenges in their campaign against Tipu Sultan. However, after a series of battles and sieges, the British were unable to achieve a decisive victory over the Mysore Kingdom. This led to a stalemate and both sides realized the need for a negotiated settlement.

Lord Macartney, along with his advisors and representatives of Tipu Sultan, engaged in lengthy negotiations to reach a settlement. The Treaty of Mangalore was the result of these negotiations and it established peace between the British and Mysore. The treaty reaffirmed the pre-war boundaries between the two sides and ensured the return of prisoners of war and captured territories.

The Treaty of Mangalore was a significant event in the history of British-Indian relations. It marked a temporary halt to the expansion of British influence in South India and recognized the power and sovereignty of the Mysore Kingdom under Tipu Sultan. Lord Macartney's role as the Governor of Madras and his efforts in negotiating the treaty played a crucial role in bringing about a resolution to the conflict.