Chulalongkorn
Phra Bat Somdet Phra Poraminthra Maha Chulalongkorn Phra Chunla Chom Klao Chao Yu Hua , or Rama V , was the fifth monarch of Siam under the House of Chakri. He was known to the Siamese of his time as Phra Phuttha Chao Luang . His reign was characterized by the modernization of Siam, government and social reforms, and territorial cessions to the British Empire and French Indochina. As Siam was threatened by Western expansionism, Chulalongkorn, through his policies and acts, managed to save Siam from being colonized. All his reforms were dedicated to ensuring Siams survival in the midst of Western colonialism, so that Chulalongkorn earned the epithet Phra Piya Maharat .
King Chulalongkorn was born onSeptember 1853 to King Mongkut and Queen Debsirindra and given the name Chulalongkorn. In 1861, he was designated Krommamuen Pikhanesuan Surasangkat. His father gave him a broad education, including instruction from European tutors such as Anna Leonowens. In 1866, he became a novice monk for six months in Wat Bawonniwet according to royal tradition. Upon his return to his secular life in 1867, he was designated Krommakhun Phinit Prachanat
Source: Wikipedia