Sir Frederic Leighton, Bt, (1830-1896) was an English painter and sculptor. His works depicted historical, biblical and classical subject matter. Leighton was bearer of the shortest-lived peerage in history; after only one day his hereditary peerage ended with his death.
While there is no black and white evidence to show that Leighton was attracted to men, his paintings and scultures give us some clues.
More on the 1st (and last) Baron Leighton here:
The Advcoate's site has a slideshow of some of his work: