Secrets of The Queen's greatest treasures
One of them is this painting of Queen Victoria, which was considered so intimate only Victoria and her husband Albert saw it.
The portrait saw the light of day in 1977, and is in our masthead. One reason we admire Victoria is that in 1863 she promised that the Indian Civil Service would be open to any applicant regardless of colour. And so it was. Satyendernath Tagore was the first of a number of Indians to pass the exam, and became one of the 'Incorruptibles'.
The BBC will examine the treasures and their histories.