Richard Darton Thomas (1777–1857) joined the British Royal Navy in 1790. On January 10, 1837 he was appointed Rear Admiral, and served as Commander-in-chief of the Pacific Fleet from May 5, 1841 to December 1844. He eventually rose to the rank Admiral of the White May 19, 1857. Oil painting portrait which hangs in the State Dining Room at Iolani Palace.