Photographer William Constable. | Jennifer Smith A photographer believed to have taken the very first portrait of the British Royal Family has been honored with a blue plaque in the English city of Brighton. The work carried out by William Constable at his studio on 57 Marine Parade, Brighton, has been rediscovered thanks to the efforts of the University of Brighton and the Smithsonian Institution. The plaque was unveiled today (May 29) at a ceremony, as curious visitors gathered along the Brighton seafront to pay homage to one of the Victorian era’s greatest marvels: photography. The U.K.’s famous blue plaques connect notable figures from the past with buildings that still stand today. The scheme, now run by the charity English Heritage, began in 1866 and is believed to be the oldest program of its kind in the world. The permanent blue circular plaques are installed on buildings associated with important historical figures across the U.K.…