Mirza Raja Jai Singh I of Amber

The Encyclopaedia of Islam names "Radja Djai Singh Kachhwaha of Amber" as the then owner of the site where the Taj Mahal was started. ¹ The article does not say which Jai Singh is meant. Because the work began in 1041/1632, in Shah Jahan's reign, the museum takes him to be Jai Singh I, the Mughal commander, and not Jai Singh II Sawai, who came to the throne of Amber only in 1111/1699. ²

Construction on the Taj Mahal started in Jumada II 1041, January 1632, after the takeover of the site had been negotiated with its owner, the raja. ¹ Mumtaz Mahal had died the year before in Burhanpur, and her body was temporarily reburied on the site in January 1632. ¹ The article records nothing more about the terms of the exchange.

The Djaypur article calls Djay Singh I the more illustrious and better known of the two rulers of that name. It says he enjoyed a mansab of 6,000 and the imperial title Mirza Radja, conferred on him by Awrangzib. ² The article on the Marathas describes a large Mughal campaign under Radja Djay Singh in 1075/1665, which led to the treaty of Purandar by which Shivaji gave up 23 of his 35 forts. ³

The articles read give no birth or death date for him. The Taj article and the Djaypur article do not state that the two are the same man; that link is the museum's reading from the dates, and it can be revised if a source says otherwise. ^{1 2}