George Macartney, 1st Earl Macartney

On his return from a confidential mission to Italy in 1795, he was raised to the British peerage as Baron Macartney, and in the end of 1796 was appointed governor of the newly acquired territory of the Cape Colony, where he remained until ill health compelled him to resign in November 1798. In early 1797 he was requested to assist with the proposed plan to send an attacking force from the Cape under Major-General J.H. Craig to the South West coast of Spanish America by way of the British colony in New South Wales.[10] He died at Chiswick, Middlesex, on 31 May 1806, the title becoming extinct, and his property, after the death of his widow (Lady Jane Stuart, daughter of the 3rd Earl of Bute; they were married in 1768), going to his niece, whose son took the name.

• Wikipedia
• The Peerage.com