HH Maharaniji Sa Jadejiji Janak Kanwarji Saheba d.of Thakore Balsinhji of Khirasra in Dhrol State HH Maharaniji Sa Jadejiji Shri Prabhat Kanwarji Saheba of Rajpur in Jamnagar State Hon Colonel.

HH Raj Rajeshwar Bharat Dharma Prabhakar Maharaja Shri Sawai Sir Jai Singhji Veerendra Shiromani Dev Bahadur GCSI GCIE, or simply Jai Singh Prabhakar, (14 June 1882 – 19 May 1937), was the Naruka Kachwaha Rajput ruler of the Princely State of Alwar from the year 1892 to 1937.

He was educated in the prestigious Mayo College, Ajmer, in which his late father was the first to take admission.

Recognising his services, he was appointed a Knight Grand Commander of the Order of the Indian Empire (GCIE) by the British in 1919.

[2] He features in the oil on canvas painting by Douglas Chandor, Prime Ministers of the Imperial Conference (October 1923).