Excerpts from Books and Wikipedia
"The Sikh Empire (…), also known as the Punjab Empire, was a state originating in the Indian subcontinent, formed under the leadership of Maharaja Ranjit Singh, who established an empire based in the Punjab. The empire existed from 1799, when Maharaja Ranjit Singh captured Lahore, to 1849, when it was defeated and conquered in the Second Anglo-Sikh War. . . . Religiously diverse, with an estimated population of 3.5 million in 1831 (making it the 19th most populous country at the time), it was the last major region of the Indian subcontinent to be annexed by the British Empire." [Wikipedia]