Jayanta Mongkol
Jayanta Mongkol, Prince Mahisara Rajaharudaya was a son of King Mongkut, Rama IV, and his Royal Consort Huang. He wasyears 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 kings insistence, the younger members of his family and extended family were all educated in Western ways, sometimes attending schools abroad.
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Source: Wikipedia