Phra Bat Somdet Phra Poramentharamaha Vajiravudh Phra Mongkut Klao Chao Yu Hua or Rama VI (1 January 1881 - 25 November 1925) was the sixth monarch of Siam under the House of Chakri, ruling from 1910 until his death. Vajiravudh is known for his efforts to create and promote Siamese nationalism. His reign was characterized by Siam's movement further towards democracy and minimal participation in World War I.