Thomas Cubitt was responsible for many large London projects including Belgravia centred around Belgrave Square, Pimlico, much of Bloomsbury and the East front of Buckingham Palace. He built three thousand feet of the Thames Embankment at his own expense.
Elsewhere, he build a similarly large development in Brighton called Kemp Town, and Osborne House on the Isle of Wight which was completed in 1851.
Queen Victoria regarded as 'her' Cubitt and after his death said of him "In his sphere of life, with the immense business he had in hand, he is a real national loss. A better, kindhearted or more simple, unassuming man never breathed."
Essay which discusses the confusion between the two William Cubitts.