The period of 4th to 6th century AD was known 'THE GOLDEN AGE OF IMPERIAL INDIA' because they made the largest achievement in terms of mathematics,astronomy, sculpting and painting during the Gupta Empire.
Delhi is one of the most aspiring state of India had an epic history. Delhi was known as 'Indarprastha' during the time of Mahabharata. It had many strong empires from Mamluk Dynasty to Lodi Dynasty. It consisted of one the most strongest kingdoms of that period.
Mughals were one of the undisputed kingdoms of medieval period. They dominated almost whole India (including Pakistan & Afghanistan). It was founded by Babur in 1526. They were from Central Asia that descended from the world famous ruler 'Genesis Khan'.
The British Empire refers to the period of British rule on the Indian subcontinent. It was 'East India Company' that took over India in 1747. Later, the power was transferred in hands of British Government. The head of British India was Queen Victoria,