Date of Birth: 
Place of Birth: Bangkok, Thailand
About Jayanta Mongkol
- Jayanta Mongkol, the Prince Mahisara Rajaharudaya (Thai: ????????????????????? ?????????????????????; RTGS: Phra-ongchao Chaiyantamongkhon Krommamuen Mahisonratchaharuethai; 30 January 1866 – 15 April 1907) was a son of King Mongkut, Rama IV, and his Royal Consort Huang.
- He was 13 years younger than his brother, Chulalongkorn, who would become Rama V.
- The prince was a leading member of the progressive clique known as the "Young Siam", on whom King Chulalongkorn relied for support in his efforts to reform the country.
- At the king's insistence, the younger members of his family and extended family were all educated in Western ways, sometimes attending schools abroad.
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